BIOB33H3 Lecture Notes - Lecture 3: Zona Pellucida, Pronucleus, Spermatozoon
Document Summary
The reproductive system: embryology and human development (based on chapter 28) Introduction: development involves, differentiation of cells, reorganization of cells, development can be characterized by different periods of time, prenatal development fertilization/conception to delivery. Involves embryology prenatal development focussing on the first two months after fertilization: postnatal development development from birth to maturity. Fertilization details: oocyte at ovulation, ovulation releases a secondary oocyte and the first polar body; both are surrounded by the corona radiata, which protects the egg. The oocyte is suspended in metaphase of meiosis ii: fertilization and oocyte activation, acrosomal reaction: acrosomal enzymes (hyaluronidase) from multiple sperm create gaps in the corona radiata. Week 4: cephalocaudal folding of head and tail. Week 5: transverse folding has created a cylindrical embryo, which now bulges into the uterine cavity; the body stalk and yolk stalk fuse to form the umbilical cord.
