- Capacitation : event/process
thinning of the acrosome 7-10 hours
- Penetration : event/process
spermatozoa burrows through the layers around the secondary oocyte
1. Corona radiata- outer layer
2. Zona pellucida - inner layer
- Fertilization : event/process
fusion of nuclei
Result is the zygote stage (46 chromosomes); monozygotic twins - identical
dizygotic twins - fraternal
- Cleavage : event/process
a. A rapid cell division with a increase in cell number and a decrease in cell size
b. Results in the morula stage (16-32 cells- looks like a berry)
5.Differentiation : event/process
a. Cells go from unspecialized to specialized cells
b. results in a blastocyst stage made of two parts
- Implantation : event/process
a. Occurs after 6 day trip to the uterus - embryo attaches to the endometrium
- Gastrulation : event/process
a. This is the formation of the germ layers in the embryo that give rise to organs b. Ectoderm - becomes the nervous system and the epidermis
c. Mesoderm - becomes muscle, bone and just about everything
d. Endoderm - becomes the inner linings with the body
- Embryonic Membranes in a one month embryo
a. Yolk sac - supplies nutrients to embryo
b. Amniotic sac - circles the embryo filled with fluid for protection c. Chorionic villi- (from the trophoblast) becomes the placenta
