Corpus luteum: Difference between revisions

Jump to navigation Jump to search
No edit summary
 
m (Bot: Automated text replacement (-{{SIB}} + & -{{EH}} + & -{{EJ}} + & -{{Editor Help}} + & -{{Editor Join}} +))
 
Line 76: Line 76:
[[Category:Overview complete]]
[[Category:Overview complete]]


{{SIB}}
 
[[he:גופיף צהוב]]
[[he:גופיף צהוב]]
[[de:Gelbkörper]]
[[de:Gelbkörper]]

Latest revision as of 00:15, 9 August 2012

Template:Infobox Anatomy

WikiDoc Resources for Corpus luteum

Articles

Most recent articles on Corpus luteum

Most cited articles on Corpus luteum

Review articles on Corpus luteum

Articles on Corpus luteum in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Corpus luteum

Images of Corpus luteum

Photos of Corpus luteum

Podcasts & MP3s on Corpus luteum

Videos on Corpus luteum

Evidence Based Medicine

Cochrane Collaboration on Corpus luteum

Bandolier on Corpus luteum

TRIP on Corpus luteum

Clinical Trials

Ongoing Trials on Corpus luteum at Clinical Trials.gov

Trial results on Corpus luteum

Clinical Trials on Corpus luteum at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Corpus luteum

NICE Guidance on Corpus luteum

NHS PRODIGY Guidance

FDA on Corpus luteum

CDC on Corpus luteum

Books

Books on Corpus luteum

News

Corpus luteum in the news

Be alerted to news on Corpus luteum

News trends on Corpus luteum

Commentary

Blogs on Corpus luteum

Definitions

Definitions of Corpus luteum

Patient Resources / Community

Patient resources on Corpus luteum

Discussion groups on Corpus luteum

Patient Handouts on Corpus luteum

Directions to Hospitals Treating Corpus luteum

Risk calculators and risk factors for Corpus luteum

Healthcare Provider Resources

Symptoms of Corpus luteum

Causes & Risk Factors for Corpus luteum

Diagnostic studies for Corpus luteum

Treatment of Corpus luteum

Continuing Medical Education (CME)

CME Programs on Corpus luteum

International

Corpus luteum en Espanol

Corpus luteum en Francais

Business

Corpus luteum in the Marketplace

Patents on Corpus luteum

Experimental / Informatics

List of terms related to Corpus luteum

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The corpus luteum (Latin for "yellow body") (plural corpora lutea) is a temporary endocrine structure in mammals, involved in the production of the progestogens which are needed for the maintenance of a pregnancy.

Development and structure

The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or estrous cycle, following the release of a mature ovum (egg) from the follicle during ovulation. The follicle first forms a corpus hemorrhagicum before it becomes a corpus luteum, but the term simply refers to the visible collection of blood left after rupture of the follicle, and has no functional significance. While the oocyte (later the zygote) traverses the Fallopian tube into the uterus, the corpus luteum remains in the ovary.

The corpus luteum is typically very large relative to the size of the ovary; in humans, the size of the structure ranges from under 2 cm to 6 cm in diameter. [1]

Its cells develop from the follicular cells surrounding the ovarian follicle:

Source Becomes Secretion
The granulosa cells the inner granulosa lutein layer progesterone, estrogen
Theca cells the outer theca lutein layer progesterone, androgens

Function

It is essential for establishing and maintaining pregnancy in females.

In the ovary, the corpus luteum secretes estrogens and progesterone, which are steroid hormones responsible for the thickening of the endometrium and its development and maintenance, respectively.

When egg is not fertilized

If the egg is not fertilized, the corpus luteum stops secreting progesterone and decays (after approximately 14 days in humans). It then degenerates into a corpus albicans, which is a mass of fibrous scar tissue.

The uterine lining sloughs off without progesterone and is expelled through the vagina (in humans and some great apes, which go through a menstrual cycle). In an estrus cycle the lining degenerates back to normal size.

When egg is fertilized

If fertilized, however, the embryo secretes the hormone human chorionic gonadotropin (hCG) or a similar hormone in other species.

This hormone signals the corpus luteum to continue progesterone secretion, thereby maintaining the thick lining (endometrium) of the uterus, and providing an area rich in blood vessels in which the zygote(s) can develop. From this point on, the corpus luteum is called the corpus luteum graviditatis.

The introduction of the hormone prostaglandin at this point causes the degeneration of the corpus luteum and the abortion of the fetus. However, in placental animals such as humans the placenta eventually takes over progesterone production and the corpus luteum degrades into a corpus albicans without embryo/fetus loss.

Additional images

External links

Reference

Template:Female reproductive system Template:Endocrine system


he:גופיף צהוב de:Gelbkörper lt:Geltonkūnis mk:Жолто тело sv:Gulkropp


Template:WikiDoc Sources