Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to corpus luteum: progesterone, menstrual cycle, corpus luteum cyst
corpus[kor´pus] (pl. cor´pora) (L.)
corpus al´bicans white fibrous tissue that replaces the regressing corpus luteum in the human ovary in the latter half of pregnancy, or soon after ovulation when pregnancy does not supervene.
corpus amygdaloi´deum amygdaloid body.
cor´pora amyla´cea small hyaline masses of degenerate cells found in the prostate, neuroglia, and other sites.
corpus callo´sum an arched mass of white matter in the depths of the longitudinal fissure, made up of transverse fibers connecting the cerebral hemispheres.
corpus caverno´sum either of the two columns of erectile tissue forming the body of the penis or clitoris.
corpus fimbria´tum a band of white matter bordering the lateral edge of the lower cornu of the lateral ventricle of the brain.
corpus genicula´tum see geniculate bodies, lateral, and geniculate bodies, medial.
1. an ovarian follicle containing blood.
2. a corpus luteum containing a blood clot.
3. a blood clot formed in the cavity left by rupture of a graafian follicle.
corpus lu´teum a yellow glandular mass in the ovary formed by an ovarian follicle that has matured and discharged its ovum; see also ovulation.
corpus mammilla´re mamillary body.
cor´pora quadrige´mina four rounded eminences on the posterior surface of the mesencephalon.
corpus spongio´sum pe´nis a column of erectile tissue forming the urethral surface of the penis, in which the urethra is found.
corpus ster´ni body of sternum.
corpus stria´tum a subcortical mass of gray matter and white matter in front of and lateral to the thalamus in each cerebral hemisphere.
corpus u´teri that part of the uterus above the isthmus and below the orifices of the fallopian tubes.
cor·pus lu·te·um, corpus luteum spuriumcorpus luteum verum
the yellow endocrine body, at least 1-1.5 cm in diameter, formed in the ovary at the site of a ruptured ovarian follicle immediately after ovulation; there is an early stage of proliferation and vascularization before full maturity; later, there is a festooned, bright-yellowish lutein zone traversed by trabeculae of theca interna containing numerous blood vessels; the corpus luteum secretes estrogen, as the follicle did, and also secretes progesterone. If pregnancy does not occur, the body is called a corpus luteum spurium (corpus luteum of menstruation), which undergoes progressive retrogression to a corpus albicans. If pregnancy does occur, the body is called a corpus luteum verum (corpus luteum of pregnancy), which increases in size, persisting to the fifth or sixth month of pregnancy before retrogression.
Synonym(s): yellow body
n. pl. corpora lutea (lo͞o′tē-ə)
A yellow, progesterone-secreting mass of cells that forms from an ovarian follicle after the release of a mature egg. Also called yellow body.
[kôr′pəs lo̅o̅′tē·əm] pl. corpora lutea
Etymology: L, corpus, body, luteus, yellow
an anatomical structure on the ovary's surface, consisting of a spheroid of yellowish tissue 1 to 2 cm in diameter that grows within the ruptured ovarian follicle after ovulation. The pleated wall of the collapsed follicle is made up of several layers of granulosa cells that grow toward the center of the cavity to form the structure. During a woman's reproductive years, a corpus luteum forms after every ovulation. It acts as a short-lived endocrine organ that secretes progesterone, which serves to maintain the decidual layer of the uterine endometrium in the richly vascular state necessary for implantation and pregnancy. If conception occurs, the corpus luteum grows and secretes increasing amounts of progesterone. It reaches its maximum function and size (2 to 3 cm) at 10 to 12 weeks of gestation. It persists, slowly diminishing in size and function, until 6 months after the onset of gestation. During the 2 weeks before menstruation, the corpus luteum secretes progesterone in decreasing amounts, atrophies, undergoes fibrotic degeneration, and becomes a pale spot on the surface of the ovary. Compare corpus albicans.
corpus luteumReproductive medicine A yellow secretory structure that forms from the ovarian follicle after ovulation; if the egg is fertilized, the CL ↑ in size, produces progesterone, persists for several months as a CL of pregnancy, which prepares the endometerium for implantation of a fertilized egg; if an egg is not fertilized, the CL degenerates and shrinks–CL of menstruation. See Luteal phase defect.
cor·pus lu·te·um, corpus luteum spurium , corpus luteum verum (kōr'pŭs lū'tē-ŭm, spūrē-ŭm, verŭm) [TA]
The yellow endocrine body formed in the ovary at the site of a ruptured ovarian follicle; a stage of proliferation and vascularization precedes full maturity; later, a bright yellow lutein zone is traversed by trabeculae of the theca interna containing numerous blood vessels; the corpus luteum secretes estrogen, as does the follicle, and also secretes progesterone. If pregnancy does not occur, it is called a corpus luteum spurium, which undergoes progressive retrogression to become a corpus albicans. If pregnancy does occur, it is called a corpus luteum verum, which grows, persisting to the fifth or sixth month of pregnancy before retrogression.
corpus luteumA yellow mass of fatty material swelling out the empty GRAAFIAN FOLLICLE in the ovary after the egg (ovum) has been discharged. The cells of the corpus luteum secrete both oestrogens and progesterone and these hormones cause the lining of the womb to thicken and form a suitable bed for the fertilized ovum. If pregnancy does not occur the corpus luteum degenerates in less than two weeks.
corpus luteum(pl. corpora lutea) an endocrine organ formed in mammals in the ruptured GRAAFIAN FOLLICLE after the process of OVULATION. The corpus luteum is responsible for secreting PROGESTERONE under the influence of LH and LTH. If fertilization of the egg occurs the corpus luteum persists during pregnancy, otherwise it degenerates at the end of the OESTRUS CYCLE. It is formed by the action of luteinizing hormone produced by the anterior lobe of the PITUITARY GLAND. Progesterone prepares the reproductive organs for pregnancy and maintains the uterine lining.
A small, yellow structure that forms in the ovary after an egg has been released.
Mentioned in: Ovarian Cysts
pl. corpora [L.] body.
accessory corpus lutea
the corpora lutea which develop during early pregnancy in the mare and which follow the subsidence of the first corpus luteum.
corpus albicans, corpora albicantia
white fibrous tissue that replaces the regressing corpus luteum in the ovary in the latter half of pregnancy.
a small mass of subcortical gray matter within the tip of the temporal lobe, anterior to the temporal horn of the lateral ventricle of the brain; it is part of the limbic system.
small hyaline masses of degenerate cells found in the prostate, thyroid, neuroglia and milk where they may be sufficient in a cow to block the teat sinus. They are formed by stasis of milk flow in a duct and inspissation of the fluids. Subsequently they may become detached and find their way to the teat.
scar in the ovary produced by atresia of a follicle when late in its development.
an arched mass of white matter in the depths of the longitudinal fissure of the brain, and made up of transverse fibers connecting the cerebral hemispheres.
corpus callosum agenesis
all or part of the corpus may be absent and there may be additional associated defects.
corpus cavernosum clitoridis
one of the pair of erectile bodies of the clitoris.
corpus cavernosum penis
either of the two columns of erectile tissue forming the body of the penis or clitoris. See also corpus cavernosum penis.
corpus cavernosum penis rupture
common in bulls occurring during mating; commonly at the distal bend of the sigmoid flexure; result in hematoma and subsequent adhesions with inability to protrude the penis properly or angulation of the penis.
corpus cavernosum urethrae
see corpus spongiosum penis.
a band of white matter bordering the lateral edge of the temporal cornu of the lateral ventricle of the brain.
1. an ovarian follicle, especially one freshly ruptured, containing blood.
2. a corpus luteum containing a blood clot.
a progesterone-secreting yellow glandular mass in the ovary formed from the wall of an ovarian follicle that has matured and discharged its ovum. See also ovulation. In most animals that do not conceive the corpus luteum regresses quickly and a new follicle develops. The corpus luteum may be retained when there is uterine pathology which mimics pregnancy; no new follicle develops and the cow fails to come into heat. Called also retained corpus luteum. A similar clinical picture is observed with cystic corpora lutea.
corpus spongiosum penis
see corpus spongiosum penis.
a subcortical mass of gray and white substance in front of and lateral to the thalamus in each cerebral hemisphere.