uterus
u·ter·us
U0160600 (yo͞o′tər-əs)uterus
(ˈjuːtərəs)u•ter•us
(ˈyu tər əs)n., pl. u•ter•i (ˈyu təˌraɪ) u•ter•us•es.
u·ter·us
(yo͞o′tər-əs)uterus
- From the Latin word meaning "belly, womb."uterus
Noun | 1. | ![]() |
单词 | uterus | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
释义 | uterusu·ter·usU0160600 (yo͞o′tər-əs)uterus(ˈjuːtərəs)u•ter•us(ˈyu tər əs)n., pl. u•ter•i (ˈyu təˌraɪ) u•ter•us•es. u·ter·us(yo͞o′tər-əs)uterus- From the Latin word meaning "belly, womb."uterus
uterus(ˈjuːtərəs) nounuterusuterus,in most female mammals, hollow muscular organ in which the fetus develops and from which it is delivered at the end of pregnancypregnancy,period of time between fertilization of the ovum (conception) and birth, during which mammals carry their developing young in the uterus (see embryo). The average duration of pregnancy in humans is about 280 days, equal to 9 calendar months. ..... Click the link for more information. . The human uterus is pear-shaped and about 3 in. (7.6 cm) long (it expands greatly during pregnancy); it normally lies in the pelvis, where it is supported by a ligament on either side extending to the pelvic wall. The body of the uterus tapers down to a necklike structure (cervix) that leads into the vagina. On either side of the uterus is an oviduct (called fallopian tube, or uterine tube, in humans) from 3 to 5 in. (7.6–12.7 cm) long, one end opening into the uterus and the other, wide-mouthed, ends in close proximity to an ovaryovary, ductless gland of the female in which the ova (female reproductive cells) are produced. In vertebrate animals the ovary also secretes the sex hormones estrogen and progesterone, which control the development of the sexual organs and the secondary sexual characteristics. ..... Click the link for more information. . These oviducts serve as passageways for the ova to reach the uterus. Fertilization occurs in the oviduct; the fertilized ovum then continues into the uterus, where it becomes implanted in the lining of that organ, also known as the endometrium. If fertilization does not occur, the ovum and the lining of the uterine wall pass out of the body through the vagina (see menstruationmenstruation, periodic flow of blood and cells from the lining of the uterus in humans and most other primates, occurring about every 28 days in women. Menstruation commences at puberty (usually between age 10 and 17). ..... Click the link for more information. ). Endometrial tissues then build up again in the uterus in anticipation of the next release of an ovum. Diseases that can affect the uterus include various sexually transmitted diseasessexually transmitted disease UterusThe hollow, muscular womb, being an enlarged portion of the oviduct in the adult female. An adult human uterus, before pregnancy, measures 3 × 2 × 1 in. (7.5 × 5 × 2.5 cm) in size and has the shape of an inverted, flattened pear. The paired Fallopian tubes enter the uterus at its upper corners; the lower, narrowed portion, the cervix, projects into the vagina (see illustration). Normally the uterus is tilted slightly forward and lies behind the urinary bladder. ![]() The lining, or mucosa, responds to hormonal stimulation, growing in thickness with a tremendous increase in blood vessels during the first part of the menstrual cycle. If fertilization does not occur, the thickened vascular lining is sloughed off, producing the menstrual flow at the end of the cycle, and a new menstrual cycle begins with growth of the mucosa. When pregnancy occurs, the mucosa continues to thicken and forms an intimate connection with the implanted and enlarging placenta. See Menstruation, Reproductive system Uterusin females a special, expanded section of the oviducts with a powerful muscular wall and a good supply of blood. In animals. A uterus is found in annelids, arthropods, mollusks, most lower vertebrates (some cartilaginous and all viviparous bony fishes), certain amphibians, many reptiles, birds, and all mammals. In oviparous vertebrates (reptiles and birds), the mature ova are held temporarily in the uterus. In viviparous animals, the embryonic development of the organism takes place there, using either the nutrients of the ovum or those of the mother. In the latter case, communication and the exchange of matter between the developing embryo and the uterus are accomplished through the placenta. The structure of the uterus differs greatly from animal to animal. In Prototheria (duck-billed platypus, spiny anteater), the uterus is paired, and each uterus opens separately into a cloaca. In marsupials (kangaroo), the uterus is also paired, but each opens into a special vagina. In placental mammals, one finds all forms from paired uterus to unpaired. Four main types of uterus are distinguished, depending on the degree of concrescence of the oviducts: uterus duplex, or two uteri, each opening independently into a common vagina (found in some rodents, elephants); uterus bipartitus, or two uteri, with the posterior sections grown together and opening by a common orifice into the vagina (in some rodents, ruminants, swine, carnivores); uterus bicornis, the most common in mammals, consisting of two uterine horns that join in the unpaired body of the uterus and opening into a vagina (in many carnivores, insectivores, cetaceans, artiodactyls, perissodactyls); and uterus simplex, consisting only of an unpaired body into which open two oviducts (in most chiropterans, primates, man). REFERENCESKholodkovskii, N. A. Uchebnik zoologii, 6th ed. Moscow-Leningrad, 1933.Kurs zoologii, 7th ed., vols. 1-2. Moscow, 1966. Marshall’s Physiology of Reproduction, 3rd ed., 2 vols. Edited by A. S. Parkes. London-New York-Toronto, 1956-58. Giersberg, H., and P. Rietschel. Vergleichende Anatomie der Wirbeltiere, vol. 2. Jena, 1968. K. M. KURNOSOV In man. In the female, the uterus is the fetus-bearing hollow muscular organ in the lesser pelvic cavity between the urinary bladder and the rectum. The human uterus weighs 40-50 g in nulliparas and 90-100 g in multiparas. The organ is pear-shaped; the larger part is made up of the body (the upper part of which, called the fundus, is enlarged). The lower, narrowed end of the uterus (cervix) is held by the vagina. The cervix consists of two parts: the vaginal (facing the vagina) and the supravaginal. The fundus of the uterus inclines forward; the body and the cervix form an angle that opens forward. The cavity inside the uterus is triangular, with two upward openings leading to the fallopian tubes. The cavity of the uterus passes the cervical canal, which opens at the uterine ostium into the vagina. The wall of the uterus consists of three membranes: outer (serous), middle (muscular), and inner (mucous). The serous membrane is represented by the peritoneum, which envelops the uterus from the front, rear, and sides and passes to the urinary bladder and the rectum, circumscribing the vesicouterine and rectouterine pouches. Along the sides of the uterus, the sheets of the peritoneum grow together to form the broad ligament of the uterus, which, together with the fascia and muscles of the pelvic floor, help to secure the organ. The middle layer of the uterus is the most powerful, consisting of three layers of smooth muscle with added elastic fibers. The mucous membrane is lined with ciliated cylindrical epithelium and holds numerous glands. This layer undergoes changes in connection with the menstrual cycle. Arterial blood is supplied to the uterus by branches of the uterine and ovarian arteries, which are especially well developed during pregnancy. Venous blood leaves the uterus through the uterine and ovarian veins; lymph, through efferent vessels to the aortoabdominal, hypogastric, and iliac lymph nodes. The uterus
is innervated by branches of the inferior mesenteric plexus and the pelvic nerves. IA. L. KARAGANOV uterus[′yüd·ə·rəs]uterusUterusuterus[u´ter-us] (pl. u´teri) (L.)The upper part of the uterus, or fundus uteri, is broad and flattened; the middle part (body), or corpus uteri, is large and open; and the lower part, or cervix uteri, is narrow and tubular and opens downward into the vagina. Two fallopian tubes enter the uterus at the upper end, one on each side. The walls of the uterus are composed of muscle, and its lining is mucous membrane. The muscular substance of the uterus is called the myometrium, and the inner lining is called the endometrium. Between puberty and menopause, the lining goes through a monthly cycle of growth and discharge, known as the menstrual cycle. menstruation" >menstruation is the time in the cycle when the tissue prepared by the uterus for a possible embryo or fertilized egg is unused and passes out through the vagina. The menstrual cycle is interrupted by pregnancy when a mature ovum is fertilized by a spermatozoon. Fertilization usually takes place in the fallopian tube; the fertilized ovum continues moving along the tube and comes to rest in the uterus, where it implants in the endometrium. The endometrium then serves to anchor the placenta, which filters nutrients from the mother's blood into the blood of the growing fetus. (See also reproduction and female reproductive organs.) ![]() u·ter·us, pl.u·ter·i(yū'tĕr-ŭs, ū'ter-ī), [TA]uterus(yo͞o′tər-əs)u·ter·us, pl. uteri (yū'tĕr-ŭs, -ī) [TA]Synonym(s): metra, womb. uterus(ut'e-rus) [L. uterus, womb]![]() AnatomyThe uterus is a muscular, hollow, pear-shaped organ situated in the midpelvis between the sacrum and the pubic symphysis. Before child-bearing, it is about 3 in. (7.5 cm) long, 2 in. (5 cm) wide, and 1 in. ( 2.5 cm) thick. Its upper surface is covered by the perimetrium, and it is supported by the pelvic diaphragm supplemented by the two broad ligaments, two round ligaments, and two uterosacral ligaments. It is usually tilted forward over the top of the urinary bladder. The upper portion of the uterus, between the openings of the fallopian tubes, is the fundus; the large central portion is the body; and the narrow lower end is the cervix, which projects into the vagina. The cavity of the uterus is widest in the fundus. The canal of the cervix is narrow, opens into the uterine cavity at the internal os, and into the vagina at the external os. The wall of the uterus consists of the outer perimetrium, middle myometrium, and inner endometrium. The uterine and ovarian arteries supply blood to the uterus. PositionsAnteflexion: The uterus bends forward. Anteversion: The fundus is displaced forward toward the pubis, while the cervix is tilted up toward the sacrum. Retroflexion: The uterus bends backward at the junction of the body and the cervix. Retroversion: The uterus inclines backward with retention of the normal curve; this position is the opposite of anteversion. See: hysterectomy; pregnancyuterus acollisuterus arcuatusuterus bicornisuterus biforisuterus bilocularisbipartite uterusuterus cordiformisCouvelaire uterusSee: Couvelaire uterusuterus didelphysDouble uterus.double uterusuterus duplexfetal uterusgravid uterushost uterusuterus masculinusuterus parvicollispubescent uterustipped uterusuterus unicornisuterusThe female organ in which the fetus grows and is nourished until birth. The uterus is a hollow, muscular organ, about 8 cm long in the non-pregnant state, situated at the upper end of the VAGINA and lying behind and above the URINARY BLADDER and in front of the RECTUM. It is suspended by LIGAMENTS from the walls of the pelvis. The lining of the uterus is called the endometrium. Under the influence of hormones from the ovaries this thickens progressively until shed during menstruation. In pregnancy, the uterus expands considerably with the growth of the fetus until it rises almost to the top of the abdominal cavity.uterusthe enlarged posterior portion of the OVIDUCT in which the embryo implants and develops in VIVIPAROUS (1) species. The human uterus is also called the womb.UterusPatient discussion about UterusQ. Is it safe to have sex with a woman with cancer of the uterus? My 45-years old wife was told she have cancer in the uterus, and will have an operation soon. Meanwhile, should we use a condom during sex? Can the tumor pass from her to me (like AIDS or HPV)? Q. I had my uterus removed in 2000, what exercises are effective for firming the flab that we women deal with? exercises to firm muscles of tummy after uterus is removed Q. Can the fetus hear through the womb? My wife wants to play music to our baby and put earphones on her pregnant stomach so he can hear it. Can he really hear the music? uterus
Synonyms for uterus
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