Embryology Lecture 1: From Fertizilation to Gastrulation
Bottom Line
Fertilization in ampulla of uterine tube
fusion of pronuclei -> division of blastomeres -> MORULA -> compaction of blastomeres so fluid into center -> BLASTOCYST w/fluid filled cavity & inner cell mass = EMBRYO; outer cell mass = TROPHOBLAST
pregnancy -> syncytiotrophoblast secretes hCG -> maintains corpus luteum -> makes progesterone -> maintain pregnancy