Gametogenesis Flashcards
development of female gamete
primordial germ cells migrate into ovary and undergo mitosis –> oogonium + mitosis –> primary oocyte
primary oocytes reside in _
follicles
primary oocytes are suspended in _
prophase, unless chosen for ovulation
primary oocyte chosen for ovulation
goes through first meiotic division –> secondary oocyte –> secondary oocyte will begin second division and be arrested at metaphase until fertilization
primordial follicle
ONE primary oocyte + surrounding epithelial cells
primordial follicles give rise to _
primary follicles –> secrete zone pellucida
antrium
fluid filled space that acts to expand diameter of follicle –> secondary follicle
formation of male spermatid
-spermatogonium undergo mitosis to become spermatocyte –> spermatocyte under goes two rounds of meiosis –> secondary spermatocyte –> spermatid
males produce spermatogonium _
throughout lifetime
spermatid to sperm
nucleus condenses to heterochromatin, centriole gives rise to microtubule tail, RER and golgi form the acrosome, mitochondria are concentrated in the middle
formation of corpus luteum
egg + mass of cumulus cells are ejected from the follicle for ovulation –> remnants of this collapsed follicle differentiate into corpus luteum
corpus luteum
produces estrogen + progesterone for the secretory stage
FSH
causes primary follicles to become secondary follicles
How many secondary follicles does FSH induce?
around 20-30 so some can stay back to secrete estrogen for development of endometriumm
How many secondary follicles does FSH induce?
around 20-30 so some can stay back to secrete estrogen for development of endometrium
proliferative phase
when layers of endometrium are built each montht
progesterone from corpus luteum
cuts off LH production
LH
aids in late stages of maturation of follicles; LH surge causes ovulation and also forms corpus luteum
menstral phase
happens when corpus luteum degenerates, resulting in plummet of estrogen and progesterone resulting in degeneration of endometrial layer
progesterone
maintains endometrium to support implantation
changes before/during fertilization
as sperm approaches egg, there is an acrosome reaction –> enzymes in acrosome help sperm get through zona pellucida –> penetration –> when sperm makes contact, changes occur in zona pellucida to inhibit any other sperm from also fertilizing the egg –> attachment stimulates second meiotic division
implanting blastocyst secretes _
hCG for maintenance of corpus luteum (so it can produce progesterone and estrogen to sustain functional layer of endometrium)
implantation at _
day 6
