Anatomy and Cell Biology 3319 Lecture Notes - Lecture 2: Cytotrophoblast, Hypoblast, Primitive Streak

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At end of 8 weeks embryo is a little person. Human gestation is divided into two phases: embryonic (first 8 week, fetal. 1st week fertilization and cell division (zygote, morula, blastocyst) 2nd week form two layers in the embryo stage of twos (bilaminar) 3rd week formation of trilayer (trilaminar) gastrulation (3 germ layers develop) 4th week formation of neural tube (brain and spinal chord) 8 (7-12) weeks - usually when external factors affect baby greatly (alcohol, drugs) *** Each month one egg & hormones are released preparing uterus for implantation of egg. Egg coated by a protein coat: zona pellucida breaks down making a cavity (eroding) changes it to blastocyst. Inferior continuous with vagina, superior is upper on uterus. Once a month on either left or right ovary, follicle starts developing and gives rise to mature oocyte and gets released from the ovary, follicle then degenerates. Ovum released goes into the body cavity.

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