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 ?
Effect of selenium on cultured bovine luteal cells.
Lipid hydroproxides evoke antigonadotropic and antisteroidogenic activity in rat luteal cells.
Effects of growth hormone, prolactin, insulin--like growth factors, and gonadotropins on progesterone secretion by porcine luteal cells.
Within a week or so, the luteal cells stop making progesterone and die.
Right after ovulation, the follicle, under the influence of LH, fills up with a new kind of cell that multiplies, called a luteal cell (luteum, Greek for yellow).
Tumor necrosis factor-a alters bovine luteal cell synthetic capacity and viability.
In rabbits, the role of LH is to sustain follicular production of estradiol, which then acts on the luteal cells to stimulate progesterone production.
A comprehensive understanding of how progesterone synthesis is maintained in this tissue requires an understanding of how the small and large luteal cells function.
Small luteal cells Hormone-producing cells of the corpus luteum that are derived from theca interna cells of the follicle.
The CL is a differentiated follicle in which the theca and granulosa give rise to the small and large steroidogenic luteal cells.
The structure and function of luteal cells change during lysis and includes an increase in lipids, vacuolization, lysis of smooth endoplasmic reticulum, condensation of chromatin, and a rapid decline in progesterone secretion.