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Topic: Corpus luteum


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In the News (Sun 15 Nov 09)

  
 Corpus luteum   (Site not responding. Last check: 2007-10-08)
The corpus luteum (Latin for "yellow body") is a small, temporary endocrine structure in mammal s that develops from an ovarian follicle after it has released a mature egg.
Corpus Juris Canonici The term corpus here denotes a collection of documents; corpus juris, a collection of laws, especially if they are placed in systematic order.
Corpus Christi Caller-Times Daily newspaper for Corpus Christi, South Texas and the Coastal Bend.
www.serebella.com /encyclopedia/article-Corpus_luteum.html   (431 words)

  
 Corpus luteum -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-08)
If the egg is not fertilized, the corpus luteum stops secreting progesterone and decays after approximately 12 days.
It then degenerates into a corpus albicans, which is a mass of fibrotic (A mark left (usually on the skin) by the healing of injured tissue) scar tissue.
The introduction of the hormone Prostaglandin at this point causes the death of the corpus luteum and the abortion of the fetus.
www.absoluteastronomy.com /encyclopedia/c/co/corpus_luteum.htm   (178 words)

  
 rupture (corpus luteum cyst) - General Practice Notebook   (Site not responding. Last check: 2007-10-08)
The corpus luteum is formed when the follicle releases the ovum at ovulation, when there is always some bleeding.
Corpus luteum cysts may be tender on palpation and cause pain in one or other iliac fossa.
Haemorrhage into a corpus luteum cyst or rupture of a cyst is a cause of acute abdomen and can be difficult to distinguish from such diagnoses as torsion.
www.gpnotebook.co.uk /cache/-1389035451.htm   (159 words)

  
 corpus luteum - Hutchinson encyclopedia article about corpus luteum
Glandular tissue formed in the mammalian ovary after ovulation from the Graafian follicle, a group of cells associated with bringing the egg to maturity.
The corpus luteum secretes the hormone progesterone, which maintains the uterus wall ready for pregnancy.
If pregnancy occurs, the corpus luteum continues to secrete progesterone until the fourth month; if pregnancy does not occur the corpus luteum breaks down.
encyclopedia.farlex.com /corpus%20luteum   (152 words)

  
 Corpus luteum   (Site not responding. Last check: 2007-10-08)
The zona granulosa and theca cells remaining in the ovary after ovulation and some surrounding capillaries and connective tissue evolve into the corpus luteum.
The corpus luteum produces progesterone and, in the event of fertilization, provides the required progesterone until the placenta is formed.
In the absence of fertilization, the life span of the corpus luteum is 14 days.
sprojects.mmi.mcgill.ca /menstrualcycle/corpusluteum.html   (59 words)

  
 * Corpus luteum - (Sexuality): Definition   (Site not responding. Last check: 2007-10-08)
corpus luteum (plural, corpora lutea): "yellow body"; a yellow mass in the ovary formed from the graafian follicle after the egg is released.
The phase of the menstrual cycle during which a follicle becomes a corpus luteum and then degenerates, releasing progesterone in the process that stimulates the growth of the uterine lining...
Progesterone: The hormone produced by the corpus luteum of the ovary that causes the uterine lining to thicken.
www.bestknows.com /sexuality/corpus_luteum.html   (286 words)

  
 Corpus Luteum Cyst of Pregnancy
A typical corpus luteum is round and fluid-filled and can range in size from less than two centimeters (about an inch) to six centimeters or more.
In fact, corpus luteum cysts appear toward the end of the menstrual cycle, last into early pregnancy, and then usually resolve over a period of time without any special treatment.
And remember: Corpus luteum cysts usually resolve painlessly by the beginning of the second trimester.
www.drspock.com /article/0,1510,5335,00.html   (399 words)

  
 corpus luteum
In vivo responses of the primate corpus luteum to luteinizing hormone and chorionic gonadotropin.
Cyclic adenosine monophosphate signaling in the primate corpus luteum: maintenance of protein kinase A activity throughout the luteal phase of the menstrual cycle.
Changes in levels of a LH binding inhibitor in aqueous extracts of porcine corpora lutea as a function of aging of the corpus luteum.
www.arclab.org /node_pages/2589.html   (365 words)

  
 Comments on the Corpus Luteum and Some Related Aspects, by Dr. Nelson Soucasaux, at the Museum of Menstruation and ...
The corpus luteum involution between its 10th and 14th days of existence seems to be due to a reduction in its LH-receptors, what makes its responsivity to the LH become smaller.
Some authors observe that, on a short term basis, the LH action upon the corpus luteum causes a reduction in the LH-receptors of the lutein cells, and that this may be the main mechanism responsible for limiting the normal lutein function to 12-14 days.
In this way, due to the local action exerted by the corpus luteum that develops there, the ovary that ovulates in one cycle would be incapable of immediately re-starting the follicular growth and, therefore, of ovulating in the next cycle.
www.mum.org /soucorpl.htm   (1322 words)

  
 Corpus luteum   (Site not responding. Last check: 2007-10-08)
The corpus luteum (Latin for "yellow body") is a small endocrine structure in mammals that develops from an ovarian follicle after it has released a mature egg.
If the egg is not fertilized corpus luteum stops secreting progesterone and decays approximately 12 days.
hCG signals the corpus luteum continue progesterone secretion thereby maintaining the thick of the uterus and providing an area in blood vessels in which the zygote can develop.
www.freeglossary.com /Corpus_luteum   (299 words)

  
 Corpus luteum Article, Corpusluteum Information   (Site not responding. Last check: 2007-10-08)
The corpus luteum (Latin for "yellow body") is asmall, temporary endocrine structure in mammals that develops from an ovarian follicle after it has released a mature egg.
The corpus luteum secretes the hormone progesterone, which thickens the uterine lining inpreparation for the fertilized egg.
hCG signals the corpus luteum to continue progesteronesecretion, thereby maintaining the thick lining of the uterus, and providing an area rich in blood vessels in which the zygote can develop.
www.anoca.org /gland/egg/corpus_luteum.html   (221 words)

  
 Menstrual Cycle : Late Luteal Phase   (Site not responding. Last check: 2007-10-08)
In the absence of fertilization, the corpus luteum degenerates and progesterone and estrogen levels subsequently fall.
Towards the end of the cycle, the corpus luteum devolves into the corpus albicans, or white scar.
As progesterone and estrogen levels decrease with the degeneration of the corpus luteum, the endometrium begins to undergo involution.
sprojects.mmi.mcgill.ca /menstrualcycle/lateluteal.html   (116 words)

  
 Corpus luteum 1
This section of a mature cat ovary shows a newly-formed corpus luteum and one that is regressing.
The luteal cells of the corpus luteum produce the hormone progesterone.
Eventually, the corpus luteum becomes smaller and non-functional, leaving only a small mass of scar tissue called the corpus albicans (not seen on this slide).
bioweb.uwlax.edu /aplab/table_of_contents/lab_18/corpus_luteum_1/corpus_luteum_1.html   (136 words)

  
 Sweet remedy
Follicular cysts and corpus luteum cysts are small and harmless and disappear within two or three menstrual cycles.
Corpus luteum cysts can grow to more than 4-10 cm in diametre and may twist the ovary.
Corpus luteum cysts are caused by excessive accumulation of blood during menstrual cycle.
cities.expressindia.com /fullstory.php?newsid=135722   (564 words)

  
 Corpus Luteum   (Site not responding. Last check: 2007-10-08)
The name is based in Latin, Corpus meaning the ‘body of man and animals’ and Luteum which is derived from the Latin word for ‘yellow’.
It is defined in the Oxford Dictionary of Biology as ‘The yellowish mass of tissue that forms from the granulosa cells in the cavity of a Graafian follicle in the ovary of a mammals after release of the egg cell.
This is provided by the corpus luteum in the form of the release of the hormone progesterone.
www.deer-uk.com /corpus_luteum.htm   (1001 words)

  
 Hamilton Research Inc. - Breeding Farm Aids - Target Progesterone Kit   (Site not responding. Last check: 2007-10-08)
Upon ovulation, a structure known as the corpus luteum forms at the site on the ovary from which the egg was released.
The corpus luteum secretes the hormone progesterone, resulting in the stoppage of "heat behavior." It also cause the uterus to tone and prepare for implantation of a fertilized egg.
The regression of the corpus luteum results is decreased progesterone levels in the blood, allowing the mare to come back into heat.
www.equitainer.com /farmaids/target.htm   (656 words)

  
 Olympus MIC-D: Brightfield Gallery - Corpus Luteum Thin Section
The corpus luteum is the enlarged remnant of the secondary (Graafian) follicle following monthly ovulation, and it features vacuoles associated with the fat-soluble steroids, estrogen and progesterone.
The female sex hormone, progesterone, plays a central role in the female reproductive cycle and is produced in the adrenal glands, the placenta, and the corpus luteum of the ovary.
The follicle then fills with blood, and becomes the corpus luteum, contributing to hormone secretion in the secretory phase.
www.olympusmicro.com /micd/galleries/brightfield/ovarycorpusluteumofovulatio.html   (441 words)

  
 Mechanisms Controlling the Function and Life Span of the Corpus Luteum -- Niswender et al. 80 (1): 1 -- Physiological ...
Corpus luteum contains a heterogeneous population of cells that includes large steroidogenic luteal cells (LLC) and small steroidogenic luteal cells (SLC), which are proposed to be luteinized granulosal and thecal cells, respectively.
as the adrenal cortex, follicle, corpus luteum, and testis in
After the corpus luteum is fully formed in the ewe, removal of the pituitary results in regression of the corpus luteum (79,
physrev.physiology.org /cgi/content/full/80/1/1   (8131 words)

  
 corpus luteum --  Encyclopædia Britannica
It also acts to maintain the corpus luteum of the ovary, which is the source of the female sex hormone progesterone.
Three naturally occurring steroids of the corpus luteum and placenta have progestational action; these are progesterone and two of its metabolites.
Corpus Christi Bay opens on the Gulf of Mexico, and the city stands on a 50-foot (15-meter) height of the southern and western shores, 130 miles (210 kilometers) southeast of San Antonio.
www.britannica.com /eb/article?tocId=9026402   (817 words)

  
 Reproductive Biology and Endocrinology | Abstract | Microvascular endothelial cells of the corpus luteum
The granulosa cells and theca cells of the developing antral follicle and the steroidogenic cells of the corpus luteum produce and respond to angiogenic factors and vasoactive peptides.
Available evidence indicates that microvascular endothelial cells of the corpus luteum are not alike, and may differ during the process of angiogenesis and angioregression.
The contributions of vasoactive peptides generated by the luteal endothelin-1 and the renin-angiotensin systems are discussed in context with the function of endothelial cells during corpus luteum formation and regression.
www.rbej.com /content/1/1/89/abstract   (400 words)

  
 Animal Sciences Research and Reviews, Special Circular 156, Prostaglandin F2-alpha Depletes the Porcine Corpus Luteum ...
The porcine corpus luteum is destroyed near the end of a nonfertile estrous cycle in response to prostaglandin F
The high concentrations of vitamin C found in the fully functional corpus luteum have led many investigators to postulate as to the role of the vitamin in luteal function.
The vitamin C concentration of the corpus luteum with reference to the stage of the estrous cycle and pregnancy.
ohioline.osu.edu /sc156/sc156_53.html   (2775 words)

  
 Reproductive Biology and Endocrinology | Full text | Recent advancements in corpus luteum development, function, ...
The corpus luteum is a dynamic tissue whose cellular composition is traced to the remnants of the ovarian follicle, neovascularization and infiltration of immune cells.
During this time, whether it is during the development, maintenance, or regression stage the corpus luteum function is mediated by a number of influences including steroids, growth factors, gonadotropins, prostaglandins, cytokines, and peptide hormones.
The corpus luteum forum is organized to sequentially convey recent developments in the development, function and regression of the corpus luteum.
www.rbej.com /content/1/1/86   (575 words)

  
 Immunohistological Localization and Expression of a-Actin in the Baboon (Papio anubis) Corpus Luteum -- Khan-Dawood et ...
The steroidogenic cells of the corpus luteum of the menstrual
Fritz MA, Fitz TA (1991) The functional microscopic anatomy of the corpus luteum: the "small cell" "large cell" controversy.
Stouffer RL, Brannian JD (1993) The function and regulation of cell populations composing the corpus luteum of the ovarian cycle in the ovary.
www.jhc.org /cgi/content/full/45/1/71   (3147 words)

  
 Rescue of the Corpus Luteum and an Increase in Luteal Superoxide Dismutase Expression Induced by Placental Luteotropins ...
In vivo generation of hydrogen peroxide in the rat corpus luteum during luteolysis.
Sugino N, Telleria CM, Gibori G. Differential regulation of copper-zinc superoxide dismutase and manganese superoxide dismutase in the rat corpus luteum: induction of manganese superoxide dismutase messenger ribonucleic acid by inflammatory cytokines.
and ß in the rat corpus luteum of pregnancy: regulation by prolactin and placental lactogens.
www.biolreprod.org /cgi/content/full/62/2/398   (3680 words)

  
 Animal Sciences - Faculty   (Site not responding. Last check: 2007-10-08)
Roles of Endothelin-1 and Tumor Necrosis Factor-a in Determining Responsivenss of the Bovine Corpus Luteum to PGF2a.
Petroff, M.G., Petroff, B.K. and Pate, J.L. Expression of cytokine messenger ribonucleic acids in the bovine corpus luteum.
Bove, S.E., Petroff, M.G., Nishibori, M., and Pate, J.L. Macrophage migration inhibitory factor in the bovine corpus luteum: Characterization of steady-state messenger ribonucleic acid and immunohistochemical localization.
www.ag.ohio-state.edu /~ansci/showdetails.php?FID=41   (207 words)

  
 In vivo responses of the primate corpus luteum to luteinizing hormone and chorionic gonadotropin -- Zeleznik 95 (18): ...
The third hypothesis is that the aging corpus luteum exhibits a diminished responsiveness to gonadotropins such that the ambient
the corpus luteum regresses in the presence of pituitary-derived
of the corpus luteum at the termination of nonfertile menstrual
www.pnas.org /cgi/content/full/95/18/11002   (4957 words)

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