corpus luteum

views updated

corpus luteum A mass of yellow tissue that remains after ovulation when a mature Graafian follicle ruptures from the ovary of a mammal. It is formed by ingrowth of the follicle wall as a result of the action of luteinizing hormone (which in turn requires the presence of prolactin from the pituitary). If ovulation does not result in fertilization, then the corpus luteum quickly degenerates. If fertilization occurs, then the corpus luteum persists and continues to secrete luteal tissue during part or all of pregnancy.

More From encyclopedia.com