The uterus is a female unpaired organ that is responsible for bearing the fetus. The shape of the organ resembles a pear, with a dome-shaped top and a narrow neck at the bottom. The uterus is a hollow muscular organ with thick walls, the width of which is about one centimeter. You can find out more information about the uterus below.
Definition and structure
The uterus is a reproductive female smooth muscle hollow organ with thick walls located in the pelvic cavity behind the bladder and in front of the rectum.
The uterus is held in place by three sets of powerful, flexible ligaments and supplied by a dense network of blood vessels and nerves. The organ has three openings: at the bottom, the cervix opens into the vagina, and in the area of the fundus, two fallopian tubes enter the body of the uterus.
The uterus is partially mobile, that is, its cervix is fixed, but the body has some freedom of movement back and forth. When a woman stands, her uterus at the junction with the cervix is usually tilted slightly forward, this position is called anteversion. However, in about a quarter of women, the uterus is tilted back.
The outside of the uterus is covered with peritoneum, a membrane that lines the entire pelvic and abdominal cavity. The inside walls are lined with endometrium, the thickness of which changes with each menstrual cycle: first it increases in preparation for pregnancy, and then, if not a single egg was fertilized during the cycle, it is discharged in the menstrual flow along with a certain amount of blood from its blood vessels.
The video will tell you more about the structure of the uterus.
Dimensions
In an adult woman who has not given birth, the uterus has on average: a length of approximately 4.5 cm, a width of 4.6 cm, and an anterior-posterior dimension of 3.4 cm. Childbirth significantly increases the size of the uterus, after childbirth it is 5.8 cm in length, in width is 5.4 cm, and the anterior-posterior dimension is 4 cm.
As a result of subsequent pregnancies, the size of the uterus in women practically does not change. After menopause, the uterus shrinks significantly, so that its cervix and body are almost equal in length. The uterus may change slightly in size if a woman's pregnancy ends in miscarriage or abortion, especially in length; it can increase up to half a centimeter.
We must not forget that the size of the uterus largely depends on the woman’s constitution and physique, so determining the size for each representative of the fairer sex is individual. The specified framework of the norm is only a guideline, but not a mandatory standard.
Functions of the uterus
The main function of the uterus is to receive a fertilized egg and nourish the fetus developing in it until it is mature enough for birth.
Bearing a fetus is the only function of the uterus. The average gestation time is 38-42 weeks. As the fetus or fetuses grow (in the case of multiple pregnancies), the muscle fibers adapt to the increase in size. At some point, the uterine muscles, which are involuntary, begin to contract (due to stimulation by oxytocin), this process is called contractions. The uterus pushes the baby towards the cervix and causes it to expand, allowing the baby to pass into the vagina. This process of contractions is accompanied by quite severe pain.
After childbirth, as a rule, the uterine muscles and ligaments restore their previous normal sizes.
Sometimes, as a result of pregnancy, the muscles and ligaments weaken and the uterus begins to move out of its position. Minor offsets are acceptable, but only minor ones. The degree of displacement is checked using ultrasound, and the acceptability of this indicator is determined by the doctor.
Pain and disorders
Almost any pain that occurs in the uterus is perceived the same way - as a spasm, although it varies in duration and strength. Pain can be caused by various reasons: loss of endometrial tissue during menstruation, labor pains, infections, etc.Anomalies of the uterus include a partitioned uterus, when a septum of variable thickness often stretches from its bottom to the cervix along its entire length, dividing the body into two or more compartments. The bicornuate uterus consists of two smaller horn-shaped bodies, each connected to a single fallopian tube, but sharing a common (though sometimes separated) cervix. A double uterus has two separate small bodies, each with its own cervix. These structural abnormalities are relatively rare, are congenital (present from birth) and may interfere with pregnancy and childbirth, depending on the extent of the abnormality.
The body of the uterus is susceptible to many disorders and diseases. The most common diseases are: uterine fibroids and cervical erosion. Very often, benign neoplasms such as fibroids and polyps develop in it; more serious diseases include malignant tumors: uterine cancer or cervical cancer.
The two most commonly performed uterine surgeries are: scraping the lining of the uterus for biopsy or treatment, abortion, or
Content
The uterus is a unique link in the reproductive system, designed for the reproduction of offspring. Only women are endowed with this natural gift. The organ is located in the central part of the pelvic region. Physiologically, it is protected by the pelvic bones, muscle frame and fat layer, which protects it from possible damage.
Location Features
The uterus is an unpaired muscular organ, which, along with the ovaries, represents the reproductive system of women. Visually, the uterus is similar to a cone or an inverted pear. The reproductive structure is represented by:
- neck;
- body;
- bottom
In the place where the vagina ends, there is a cervix - the lower part of the organ, similar to a cylindrical tube, three centimeters long. Cervical parameters are not constant, values vary during pregnancy and in old age.
Inside the cervix there is a narrow cervical canal. The cervical canal is the connecting element between the uterus and vagina.
Above the cervix is the uterine body - the place where the embryo develops. The body of the uterus is represented by thick walls (about three centimeters), consisting of three layers.
- Mucous - endometrium. The inner lining of the cavity. It is the endometrium that is involved in the formation of menstruation, being shed monthly if pregnancy does not occur. But if conception has occurred, then the fertilized egg also clings to the endometrium.
- Muscular - myometrium. This layer provides muscle contractions during contractions. It also contracts after sexual intercourse, facilitating better penetration of sperm.
- Serous - perimeter. This is the peritoneal membrane covering the outside of the organ.
The fundus is located at the very top of the organ, in the place where the openings of the fallopian (uterine) tubes are located.
The woman’s womb is not fixed, it is in a “suspended” state: the necessary position is provided by the ligaments holding the uterus. So, where is a woman's uterus?
Correct anatomical uterine position in women:
- at equal intervals from the internal boundaries of the pelvis;
- in front of the rectum;
- behind the bladder;
- with a slight forward slope;
- an obtuse angle is created with the neck.
The reproductive organ is located in the center of the pelvis. The slightest imbalance in its location initiates disruptions in healthy functioning. Having understood which side the uterus is on, you should become familiar with the functions it performs in the female body:
- provides embryo implantation;
- does not allow infections to penetrate through the vagina into nearby pelvic organs;
- responsible for menstrual functioning;
- creates the necessary conditions for successful fertilization, development and birth of the fetus.
The described characteristics confirm the fact that the uterus is the main instrument in the female body.
Localization of the organ during pregnancy
Different periods of a woman’s life directly affect the shape and size of the uterus. In a young nulliparous girl, the parameters and weight of the uterus are smaller (50 grams) than in those who have given birth (about 100 grams). The most significant changes occur with the reproductive system when a woman is preparing to become a mother, and in the postpartum period.
In a healthy woman, the position of the uterus does not change; the situation changes after pregnancy. After 12 weeks, the muscle organ becomes larger. This can be determined even by palpation.
As the embryo grows, the location of the uterus changes. It is located:
- up to 12 weeks - in the abdominal area;
- after 15 weeks - at the level of the navel;
- after 20 weeks - gradually rises to the diaphragm.
In the last weeks of pregnancy, the bottom is so high that most expectant mothers experience difficulty breathing. In addition, compression of the intestines and bladder occurs.
Not only the location of the uterus changes, but also the properties and parameters of the cervix. Closer to the time of delivery, the cervical canal smoothes out and becomes shorter. The success of childbirth depends on this transformation: after all, a long “oaky” neck indicates the body’s unpreparedness for childbirth. This situation requires hospitalization of the patient and the adoption of measures to prepare the cervical canal for labor.
Gynecological abnormalities
The norm is for the uterine and pelvic axis to be parallel to each other. A slight deviation from the axis is not considered a pathology. However, with some dysfunctions, the localization of the uterus and appendages changes, and a significant deviation from the axis is observed. Such diseases include prolapse, bending or prolapse of the uterus.
The uterine location depends on the muscle fibers that hold it. If muscle tone weakens, prolapse occurs. Without proper treatment, complete loss may occur. At the initial stage of uterine prolapse, it is recommended to perform Kegel exercises. This will avoid loss and surgical interventions.
The female reproductive system is susceptible to dysfunction and various types of pathologies. The most common ones include:
- myoma;
- erosion;
- dysplasia;
- polyps, cysts;
- cancerous tumors.
The modern medical base has a wide range of possibilities for curing almost any ailment. The main factor in successful therapy and prevention is constant monitoring of the state of the reproductive system.
Along with treatable gynecological dysfunctions, there are violations of the anatomical structure of the female system, many of which are the cause of infertility and difficulties in everyday life.
Uterine anomalies are quite rare, however, they do exist.
- Double uterus. Combined with double vagina. This pathology is often diagnosed along with other defects: pathologies of the kidneys and ureters.
- Two-horned. Bicornus is characterized by varying degrees of severity. Visually, the uterus is similar to the shape of a heart.
- One-horned. This defect occurs due to incomplete development of the uterine (Müllerian) canal. Women experience pain during sexual intercourse and are unable to become pregnant.
- Saddle. In this case, only the fundus of the uterus is abnormally divided: an unusual depression is formed in it. A woman is able to conceive, but there are problems with pregnancy.
- Uterus with septum. With this pathology, the shape of the organ remains normal, but the cavity is separated by a partial or complete septum.
The described disorders of the anatomical structure of the female reproductive system are not diagnosed so often. The most common anomaly is the saddle uterus.
Every woman must know where the uterus is and understand its functions and features. This knowledge will help to avoid pathological complications and identify the disease at the initial stage.
Basic knowledge of anatomy and physiology can help a woman avoid problems during conception, pregnancy and childbirth, as well as prevent various reproductive diseases. Therefore, it is useful to learn about such an important organ of the female reproductive system as the uterus: how it is structured and how it changes throughout life, during pregnancy and birth of a child.
What is the uterus and where is it located?
The uterus is an organ of a woman’s reproductive system in which the fetus develops from the moment the fertilized egg leaves the fallopian tube until the child is born. Its shape resembles an inverted pear.
The uterus is located in the pelvis between the bladder and rectum. Its position can change during the day: when the organs of the urinary and digestive systems are filled, it moves slightly, and after urination or defecation it returns to its original place. But the most noticeable change in the position of the uterus is observed simultaneously with its growth during pregnancy, as well as after childbirth.
Structure of the uterus
Using an ultrasound of the uterus, you can see that it consists of three structural parts. The upper convex side is called the bottom, the middle widened part is called the body, and the lower narrow part is called the .
The cervix consists of an isthmus, an elongated cervical canal and a vaginal part. The inside of the uterus is hollow. Its cavity communicates on the lower side with the lumen of the vagina, and on the sides with the canals of the fallopian tubes.
The organ wall is three-layered: 
1 The outermost layer facing the pelvic cavity is called perimetry. This membrane is closely connected with the outer covers of the bladder and intestines and consists of connective tissue cells.
2 Middle, thickest layer – myometrium, includes three layers of muscle cells: outer longitudinal, circular and inner longitudinal - they are named after the direction of the muscle fibers.
3 Inner shell, endometrium, consists of a basal and functional layer (facing the uterine cavity). Contains epithelial cells and many glands in which uterine secretions are formed.
The cervix has more connective dense collagen tissue and fewer muscle fibers than other parts of the organ.
The wall of the uterus is penetrated by numerous blood vessels. Arterial blood, saturated with oxygen, is brought by paired uterine arteries and internal branches of the iliac artery. They branch and give rise to smaller vessels that supply blood to the entire uterus and its appendages.
The blood that has passed through the capillaries of the organ is collected in larger vessels: uterine, ovarian and internal iliac veins. In addition to blood vessels, the uterus also contains lymphatic vessels.
The vital activity of uterine tissue is controlled by hormones of the endocrine system, as well as the nervous system. The wall of the uterus includes branches of the pelvic splanchnic nerves associated with the inferior hypogastric nerve plexus.
Ligaments and muscles of the uterus
In order for the uterus to maintain its position, it is held in the pelvic cavity by connective tissue ligaments, of which the most famous are:
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1 Paired broad ligaments of the uterus(right and left) are attached to the peritoneal membrane. Anatomically, they are connected to ligaments that fix the position of the ovaries.
2 Round ligament contains both connective tissue and muscle cells. It starts from the wall of the uterus, passes through the deep opening of the inguinal canal and connects with the tissue of the labia majora.
3 Cardinal ligaments connect the lower part of the uterus (near the cervix) with the urogenital diaphragm. This fixation protects the organ from displacement to the left or right.
Through ligaments, the uterus is connected to the fallopian tubes and ovaries, which ensures the correct relative position of the organs of the female reproductive system.
In addition to the ligaments, the correct location of the pelvic organs, including the uterus, is ensured by a set of muscles called the pelvic floor. The composition of its outer layer includes the ischiocavernosus, bulbospongiosus, superficial transverse and external muscles.
The middle layer is called the urogenital diaphragm, it contains the muscle that compresses the urethra and the deep transverse muscle. The internal pelvic diaphragm unites the pubococcygeus, ischiococcygeus and iliococcygeus muscles. The pelvic floor muscles prevent deformation of the organs, which would impair their blood supply and function.
Uterus dimensions
When a girl is born, the length of her uterus is about 4 cm. It begins to increase at the age of 7. After the final formation of the reproductive system during puberty, the uterus reaches dimensions of 7-8 cm in length and 3-4 cm in width. The thickness of the walls in different parts of the organ and in different phases of the menstrual cycle varies from 2 to 4 cm. Its weight in a nulliparous woman is about 50 g.
The most significant changes in the size of the uterus occur during pregnancy, when in 9 months it increases to 38 cm in length and up to 26 cm in diameter. Weight increases to 1-2 kg.
After childbirth, a woman’s uterus shrinks, but does not return to its original parameters: now its weight is approximately 100 g, and its length is 1-2 cm greater than before conception. These sizes remain throughout the entire childbearing period; after the second and subsequent births, no noticeable increase occurs.
When a woman's reproductive period ends and menopause occurs, the uterus decreases in size and weight, the wall becomes thinner, and the muscles and ligaments often weaken. Already 5 years after the end of menstruation, the organ returns to the size it was at birth.
Uterus during pregnancy
During each menstrual cycle, a woman of reproductive age experiences periodic changes in the structure of the uterus. Most of all they affect the functional endometrium.
At the beginning of the cycle, a woman’s body prepares for the possible onset of pregnancy, so the endometrium thickens and more blood vessels appear in it. The amount of discharge from the uterus increases, which supports the viability of sperm.
If conception does not take place, after the death of the egg released from the follicle, the functional layer is gradually destroyed under the influence of hormones, and during menstruation its tissues are rejected and removed from the uterine cavity. With the beginning of a new cycle, the endometrium is restored.
If the egg is fertilized and pregnancy occurs, continuous growth of the uterus begins. The thickness of the functional endometrium increases: it is no longer rejected, because menstruation has stopped. The layer is penetrated by an even greater number of capillaries and is supplied with blood more abundantly in order to provide the organ itself (which is growing rapidly) and the baby developing in the uterine cavity with oxygen and nutrients.
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The volume of the myometrium also increases. Its spindle cells divide, elongate and increase in diameter. The layer reaches its maximum thickness (3-4 cm) approximately in the middle of pregnancy, and closer to childbirth it stretches and because of this becomes thinner.
During regular examinations, starting from the 13-14th week of pregnancy, the gynecologist determines the height of the uterine fundus. By this time, its upper part, due to the increase in the size of the organ, extends beyond the pelvis.
By week 24, the uterine fundus reaches the level of the navel, and at week 36 its height is maximum (palpable between the costal arches). Then, despite the further growth of the abdomen, the uterus begins to descend due to the baby moving down, closer to the birth canal.
The cervix during pregnancy is thickened and has a bluish tint. Its lumen is covered with a mucous plug, which protects the uterine cavity from infections and other unfavorable factors (read about the removal of the plug on the website). Due to the rapid growth of the uterus and displacement from its usual place, its ligaments are stretched. In this case, pain may occur, especially in the third trimester and with sudden body movements.
Contraction of the uterus during pregnancy and childbirth
The myometrium (middle, thickest layer of the uterus) contains smooth muscle cells. Their movements cannot be controlled consciously; the process of fiber contraction occurs under the influence of hormones (primarily oxytocin) and the autonomic nervous system. The muscle fibers of the myometrium contract during menstruation: this ensures the expulsion of secretions from the uterine cavity.
During pregnancy, the uterus also sometimes contracts. Its surface hardens, and the pregnant woman may feel pain or heaviness in the abdomen.
This happens either because of a threat (hypertonicity) or during pregnancy, which periodically occurs when carrying a child and prepares the myometrium for labor.
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The uterus is the most important organ of the female structure. Thanks to her, childbearing becomes possible. It is in the uterus that the fertilized egg continues to develop, and at the end of the gestation period it contains a fully formed child.
Location of the uterus
We are talking about a hollow pear-shaped organ. Its natural location is in the pelvic area. The bladder and rectum are adjacent to this organ. The uterus is slightly tilted forward. It is securely fixed in its position, but at the same time has sufficient mobility.
This is facilitated by special ligaments. They allow the organ to safely respond to environmental changes and at the same time occupy a comfortable position. For example, when fluid accumulates in the bladder, the uterus moves slightly back, and when the rectum is full, it rises.
The ligaments have a complex attachment. Its nature explains why pregnant women should not raise their arms high often. In this position, the ligaments are stretched, the uterus becomes tense and shifts. As a result, the fetus may take an incorrect position, which is undesirable in the later stages of gestation.
The weight of the uterus may change. After childbirth, it becomes heavier on its own. During pregnancy, the uterus, having elastic walls, increases many times over. It is capable of supporting a five-kilogram fetus. At the end of the childbearing period, the uterus shrinks, its tissues atrophy, and sclerotic changes occur in the blood vessels.
Organ structure
The uterus is formed by several sections.
Neck
This part is transitional between the vagina and the uterine cavity. It is a kind of muscular tube, making up approximately a third of the organ. The cervical canal runs inside. At the bottom, the neck ends in a pharynx. This hole is the entrance for sperm trying to penetrate the egg. Menstrual blood also flows through the throat.
The cervical canal is filled with a thick substance produced by its mucous membrane. One of the functions of such a “plug” is to kill harmful microorganisms that can infect the uterus and its tubes. The latter open into the peritoneum. Therefore, mucus protects not only the uterus itself from infection, but also indirectly the internal organs.
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During ovulation, the substance in the canal becomes less dense. The environment of the cervix during this period is favorable for male cells and promotes their mobility. The same thing happens with mucus during menstruation. Such changes are necessary so that blood can flow out freely. In both situations considered, the female body becomes more vulnerable to infection. By the way, infection can also occur through sperm, so intimacy with a stranger is undesirable.
The shape of this part of the uterus is not always the same. Before birth, the cervix is round in cross section and resembles a truncated cone. Women who have given birth experience changes in this area. The neck expands and takes on a cylindrical shape. The same thing happens after an abortion. During an examination, the gynecologist clearly sees these changes, so it is impossible to deceive him.
Isthmus
This short section connects the cervix to the main part of the cervix. During labor, the isthmus helps the tract widen so that the fetus can be successfully delivered. This is a vulnerable place where ruptures can occur.
Body of the uterus
The internal structural element of this main part of the organ is the endometrium. The mucosal layer, as it is also called, has many vessels. The endometrium is very sensitive to the action of hormones. During the menstrual cycle, it prepares for pregnancy. If fertilization does not occur until a certain point, the endometrium partially exfoliates. Menstrual bleeding is observed these days. After part of the endometrium comes out, the growth of this uterine layer begins again to a certain limit.
At conception, the endometrium becomes a “nest” for the embryo. During this period, it is not rejected, obeying the changed action of hormones. Therefore, women carrying a child do not normally bleed. If discharge appears, this should alert you.
The middle layer in the body of the uterus is formed by muscles. They themselves are very strong, so much so that they are able to push out a grown fetus during childbirth. At this point, the muscles are further strengthened and reach their maximum development. This dense layer of the uterus also plays a major role in protecting the fetus from shock.
The muscles of the organ are always in good shape. Their constant contraction and relaxation is observed. Muscle movements are especially intense in connection with sexual intercourse. Thanks to this, sperm travel safely to their destination. In addition, the uterus contracts more strongly during menstruation. This promotes successful endometrial shedding.
The body of the uterus also has an outer layer - the perimeter. The tissue it consists of is connective. The perimetry covers most of the organ. The exception is some areas in the area above the vagina.
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Uterine abnormalities
The organ may be in an incorrect position. There are also cases when the proportions of the uterus are disturbed or its size deviates greatly from the norm. Typically, such defects originate in the prenatal period. This is caused by viral infections, taking certain medications, alcoholism and other factors. Examples of anomalies encountered:
- Unicornuate uterus. This pathology appears due to abnormal growth of the so-called Müllerian ducts. They are paired canals that form after approximately two months of embryonic development. A unicornuate uterus occurs when one of the ducts stops growing. Often, simultaneously with such an anomaly, defects of the urinary system are observed.
- Bicornuate uterus. In this state, the organ has two cavities. In addition, an incomplete bicornuate uterus is sometimes found. In its outline, it resembles a heart - there is a common cavity, and the bottom - in the uterus this is the upper part - is, as it were, divided into two parts. The cause of the described conditions is the incomplete fusion of the same Müllerian ducts in their middle part.
- Saddle uterus. With such a pathology, a woman may not be bothered by any symptoms. But ultrasound and other research methods used reveal a saddle-shaped notch in the fundus. With such an anomaly of the uterus, there is a chance to carry a child normally and give birth to him. Along with this, cases of premature birth are not uncommon. Various pathologies of the placenta may occur or abnormal position of the fetus may occur.
- Hypoplasia of the uterus. This condition is characterized by the development of the organ in a reduced form. At the same time, the girl as a whole is lagging behind in development. She is too short in stature, has a narrow pelvis and greatly reduced breasts. A gynecologist can already identify this pathology during an examination. To confirm the diagnosis, an ultrasound is performed and hormone levels are determined.
You can always check the condition of your female organs at our Euromedprestige medical center. We can conduct a complete diagnosis, and if problems are identified, enlist the support of experienced doctors.
The muscular hollow organ of a woman in which the development of a fertilized egg occurs.
The uterus performs menstrual and reproductive functions, and the fetus develops and bears in it.
Located in the pelvis between the bladder and rectum.
Its length is 7-8 cm, width 4-6 cm, weight 50-60 g. The wide upper part of the pear-shaped uterus is called the body, the narrow lower part, as if inserted into the vagina, is the cervix. The body of the uterus has a triangular-shaped cavity, which narrows towards the cervix and opens into the vagina through a narrow canal, the so-called external uterine os. At the top, the uterine cavity communicates with the fallopian tubes.
The glands of the uterine body produce a watery secretion that moisturizes the surface of the mucous membrane lining the inside of the uterine cavity. The wall of the uterus consists of 3 layers (shells): mucous (endometrium), muscular (myometrium) and serous (perimetry). The uterine cavity is lined with a mucous membrane, abundantly supplied with blood vessels, its surface layer undergoes periodic changes associated with the menstrual cycle, and the deeper layer takes part in the restoration of the mucous membrane after the surface layer is rejected from it during menstruation. The mucous membrane of the cervical canal of the uterus is rich in glands that produce translucent thick mucus, which fills the lumen of the canal in the form of a mucus plug. Mucus contains special substances that can kill pathogenic bacteria, and thereby protects the uterus and fallopian tubes from pathogens that can be introduced or independently penetrate the vagina. The muscular layer of the uterus is the most powerful; it is a dense plexus of bundles of smooth muscle fibers (located in several layers and in different directions), between which lie layers of connective tissue and elastic fibers. The uterine muscle is well supplied with blood and plays a major role in uterine contractions during childbirth.
Outside, the uterus is covered with a connective tissue serous membrane.
The uterus has physiological mobility; occupying its original position in the center of the small pelvis, it can move posteriorly when the bladder is full, anteriorly when the rectum is full, and rise upward during pregnancy.
The uterus undergoes very significant recurrent changes in the postpartum period.
During menopause, the uterus decreases in size, atrophy of its mucous membrane, wrinkling of the stroma and sclerotic changes in the blood vessels are noted. Disorders of the development of the uterus include congenital defects (complete absence of the uterus - aplasia, duplication, bicornuity, etc.), as well as hypoplasia, positional anomalies (uterine prolapse, displacement, prolapse, etc.). Diseases of the uterus are more often manifested by various disorders of the menstrual cycle and associated infertility, miscarriage, as well as inflammatory diseases of the genital organs and tumors.
(Source: Sexological Dictionary)
(lat. uterus), the reproductive organ in which the development of the fetus occurs. In a woman, it is located in the pelvic cavity between the bladder and rectum.
(Source: Dictionary of Sexual Terms)
Synonyms:See what “Uterus” is in other dictionaries:
UTERUS, except for the direct meaning of mother: | woman, woman; | female, any female animal: mares, at a horse farm, are also called queens. Bees have one queen in each swarm, the rest are divided into drones (males) and workers, farm laborers. Bees' queen... Dahl's Explanatory Dictionary
UTERUS- (uterus), the organ that is the source of menstrual blood (see Menstruation) and the site of development of the fertilized egg (see Pregnancy, Childbirth), occupies a central position in the woman’s reproductive apparatus and in the pelvic cavity; lies at the geometric center... ... Great Medical Encyclopedia
UTERUS, uterus, female 1. The internal part of the female genital organs, in which the embryo develops. Diseases of the uterus. 2. The female is the breeder in animals. Deer queen. The horse farm had many breeding queens. Queen bee. 3. transfer Designation... ... Ushakov's Explanatory Dictionary
- (uterus), a sac-like or canal-shaped organ of the female reproductive system in animals and humans, serving as a container for eggs or embryos. Usually, embryos develop in M. and their nutrition and gas exchange are ensured. In invertebrates M. is called. various... ... Biological encyclopedic dictionary
Producer, parent, mother, mother, mother, mother, mother, mother, mother, mother, mother, mother, mother, mother, mare, rabbit, aircraft, mother, darling, mother, mother, mother, mother, mother, mother, mother, … … Dictionary of synonyms
Characteristics Length 64 km Basin area 392 km² Basin Barents Sea Basin of the Pechora rivers Watercourse ... Wikipedia
Modern encyclopedia
A muscular reproductive organ in female animals and women, representing an expanded part of the oviduct. In oviparous animals (reptiles, birds, cloacals), mature eggs are temporarily placed in the uterus; in viviparous women the embryo develops. U... ... Big Encyclopedic Dictionary
UTERUS, a hollow, muscular organ located in the pelvic region of female mammals. Protects and nourishes the growing FETUS until birth. The upper part is wide, with FALLOPIAN TUBES branching off on each side. Below, the uterus narrows into a cervix leading to... ... Scientific and technical encyclopedic dictionary
Uterus- UTERUS, a muscular reproductive organ in female animals and women. In oviparous animals (reptiles, birds, cloacals), mature eggs are temporarily placed in the uterus, while in viviparous animals the embryo develops. In humans, the uterus is the reproductive organ; ... ... Illustrated Encyclopedic Dictionary
UTERUS, and, female 1. The internal organ of a woman and the females of many viviparous and oviparous animals, into which the embryo develops. 2. The female is the breeder in animals. Olenya m. Pchelinaya m. 3. Same as mother (in 1 value) (region). 4. Special military... Ozhegov's Explanatory Dictionary
