Chapter 2- First Week of Development Flashcards
Meiosis I events
reduction division, homologues separate
Spermatogonia
sperm primordial germ cells
Oogonia
egg primordial germ cells
karyogamy
fusion of the 2 nuceli of the sex cells
FSH effects
Follicle stimulating hormone, stimulates development of ovarian follicles and production of estrogen by follicular cells
LH effects
Luteinizing hormone, triggers ovulation and stimulates follicle cells and corpus lutetium to release progesterone
hCG- human chorionic gonadotrophin
causes corpus luteum of pregnancy to form and allows for maintenance
gamete intrafallopian (intratubal) transfer
fertilization occurs in uterine tube; several oocytes and sperm placed in tube for fertilization to occur
Cleavage begins _____ hours after fertilization
30
Compaction and polarization occurs after _________
9 cell stage
morula time and # blastomeres
3 days post fertilization
12-32 blastomeres
Blastocyst cavity appears
4 days after fertilization
Blastocyst is made up of…
trophoblast
embryoblast
trophoblast
outer layer of blastocyst, placenta
embryoblast
inner layer, embryo
early pregnancy factor in maternal serum ______ after fertilization
24-48 hours
blastocyst attaches to endometrial lining ____ after fertilization
6 days
trophoblast differentiates into ___ and ___
cytotrophoblast
syncytiotrophoblast
cytotrophoblast
inner layer of trophoblast
syncytiotrophoblast
multinucleated outer layer of trophoblast that implants into endometrial lining
early pregnancy factor role and method of secretion
immunosuppressant
secreted by trophoblast
