Corpus Luteum

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corpus luteum

[′kȯr·pəs ′lüd·ē·əm]
The yellow endocrine body formed in the ovary at the site of a ruptured Graafian follicle.

Corpus Luteum


in mammals and man, an endocrine gland that develops in the ovary at the site of the graafian follicle after rupture of the follicle wall and discharge of the ovum (ovulation); it consists of altered follicular (so-called lutein) cells. If pregnancy does not follow ovulation, the corpus luteum degenerates within one or two weeks (periodic, or menstrual, corpus luteum); if, however, the ovum is fertilized and pregnancy begins, the corpus luteum grows very rapidly (corpus luteum of pregnancy) and is retained throughout the greater part of pregnancy, secreting the hormone progesterone, which is necessary for the maintenance and development of the pregnancy.

The term “corpus luteum” is sometimes applied to the aggregate of follicular cells formed in the ovary at the site of discharge of the mature ovum in some invertebrates (insects) and in the majority of vertebrates (amphibians, reptiles, and birds).

References in periodicals archive ?
In the final third of gestation (from embryonic stage 23 onward), when the shell membrane has covered the embryo, the ovaries consist of previtellogenic follicles, corpora lutea, and small vitellogenic follicles (with yolk grains in the periphery).
Statewide means ([+ or -] SD) of field-dressed body weight and number of corpora lutea of harvested female moose in 3 consecutive time periods in New Hampshire, 1988-2009.
Of the remaining 60 tracts, corpora lutea were present in 13 of 26 (50.
The proportion of the number of pregnant animals and the difference in the mean number of implantation sites, embryos in development, corpora lutea and organ weights in the treated versus control groups was compared using Analysis of Variance (ANOVA) (Ostle, 1973).
In the corpora lutea of the ovary, whirls of long needles are most distinct.
Mature females may present previtellogenic, vitellogenic and atretic follicles, and corpora lutea.
Later, the mean number of ovarian follicles and corpora lutea of each ovary were calculated in the selected sections.
As shown in Figure 4A, adult animals neonatally exposed to BPA500 showed a lower number of corpora lutea and a higher number of atretic follicles, many of which were cystic.
Immunolocalization of cholesterol side-chain-cleavage cytochrome P-450 and ultrastructural studies of bovine corpora lutea.
The number of life/death fetuses, the weight of each litter, gross malformation and the number of corpora lutea were recorded.
One June female (LACM 102023) collected 16 June contained corpora lutea but no oviductal eggs indicating a recent ovulation.
The seasonal character of female moose reproduction may be related to increased activity of the corpora lutea 2-3 months after calving, which would increase progesterone levels in blood.