Corpus Luteum

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Related to luteal: short luteal phase, Luteal cells

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 ?
12) hypothesized that GnRH receptors in the tubal epithelium may play a role in fertilization, early embryonic development, and implantation during the early luteal phase via a combination of paracrine and autocrine methods.
It is known that the energy and protein intake affect reproductive performance [5,6,20], so, in order to accurately assess the effect of Se on luteal function, the amount of feed supplied to the cows was controlled to meet their nutritional requirements of dairy cows [16].
Although an advantage of the GnRH agonist trigger is the ability to retrieve oocytes in high responders with a markedly reduced risk of OHSS, the induction of early luteolysis after the GnRH agonist trigger represents a problem that requires the use of aggressive steroidal luteal support or low-dose hCG to allow successful fresh embryo transfer (ET) and live birth.
12 The addition of E2 in the luteal phase for improvement in the rate of pregnancy or implantation rates in the selected cases of poor responders is still a subject of debate.
Three urine specimens were chosen from each menstrual cycle, including at least one specimen from the luteal phase.
The week before onset of menstruation (The last week of the luteal phase) was compared with first week of follicular phase, beginning on day 2 of the same cycle.
Luteal phase: Day 19-24 (nearer to peak level of progestin hormone)
2[alfa]]) por el endometrio, la funcion luteal en perras no gestantes es independiente de luteolisinas uterinas.
KEY WORDS: Estradiol; Menstrual cycle, Follicular phase; Menstrual cycle, Luteal phase; Nitric oxide; Progesterone.
Based on progesterone profiles, the luteal phase was defined as the period between 2 consecutive elevations of plasma progesterone of [greater than or equal to] 0.
4,5 The exact role of mid- luteal E2 is subject to differences on the basis of estimation on different days of the luteal phase.