BIOB33H3 Lecture Notes - Lecture 3: Primitive Streak, Yolk Sac, Syncytium
Document Summary
Biob33 lecture 3 the reproductive system: embryology and human development. Nucleus 22 haploid chromosome, one x or y. Midsection filled with mitochondria and is the motor that powers the sperm. Protected by two layers: corona radiata and zona pellucida. Corona radiate rigid type layer; think crown like. Zona pellucida gel like inner protective layer. Polar body only helps develop the eggs. Secondary oocyte suspended in metaphase of mitosis ii. Eggs travel from ovaries thru the uterine tube then the uterus. Ampulla wide portion of the uterine tube. Endometrium think wall of the uterus; this is where the egg implants itself if it becomes fertilizes and will develop inside the wall. 2 million sperm during ejaculation then only 10 000 make it into uterine tube and only 100 make it to the egg fertilization and oocyte activation. Enzyme hyaluronidase released from the sperm"s acrosome in order to break down the corona radiata.
