BIOM 3200 Lecture Notes - Lecture 14: Zona Pellucida, Corpus Luteum, Acrosome

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 3200
• Professor: Tami Martino

Document Summary

20. 6 fertilization, pregnancy, and parturition: once fertilization has occurred, the secondary oocyte completes meiotic division. It then undergoes mitosis and forms an early embryonic structure called a blastocyst. These enzymes, allow the sperm to digest a path through the zona pellucida to the oocyte: fertilization, acting through a second messenger stimulates the endoplasmic reticulum of the oocyte to release its stored ca 2 1 . Some of these changes prevent other sperm from fertilizing the same oocyte. Fertilization therefore can occur if intercourse takes place within a three-day period prior to the day of ovulation. Cleavage and blastocyst formation: zygote divides 30-36 hours after fertilization (aka cleavage) four celled ball(40 hrs after fert. ) 8 celled morula (50-60 hrs after fert. ) Enters uterus 3 days after ovulation: continued cleavage produces a morula consisting of 32 to 64 cells by the fourth day following fertilization.