the

corpus luteum

after ovulation the cells of the

follicle which did not leave with the OA

site into the oviduct

form a brief corpus hemorrhagic them as

blood clots from the rupture and then

forms a temporary endocrine structure

known as the corpus luteum this is

primarily composed of the thecal cells

and the follicular cells which undergo

changes known as lutein ization in the

maturing follicle substances in the

follicular fluid inhibit this process

which then occurs after the follicle

ruptures these cells then form the small

and large luteal cells with the

follicular cells forming the larger

cells and the thecal cells form in the

smaller cells which then metabolize

cholesterol to produce androgens and

from these androgens to produce

progesterone instead of estrogen at

least primarily some estrogen is also

produced as are other signals such as

inhibin egg this is because new enzymes

have been produced for the conversion of

these androgens into progesterone under

the influence of LH at ovulation the

corpus luteum will be maintained for

about seven to fourteen days after

ovulation unless the signal from a

developing embryo human chorionic

gonadotropin is released which in which

case the corpus luteum will be

maintained for another three months

secreting the progesterone which means

the uterine lining maintains the uterine

lining that the embryo has attached to

um at which point then the placenta

three months later is making sufficient

hormones to maintain itself if

implantation and the signal 8c

she are not produced then the corpus

luteum will break down into the corpus

albicans and ultimately from their scar

tissue as a new menstrual cycle begins

the progestins in birth control pills

are mimicking the action of the

progesterone produced by the corpus

luteum in case of pregnancy which then

inhibits on subsequent menstrual cycle

from beginning