NATS 1675 Study Guide - Midterm Guide: Mesonephric Duct, Cyclic Adenosine Monophosphate, Paramesonephric Duct

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Continued differentiation & growth of tissues & organs. Increase in crown rump length & weight. At end of week 8 3 cm long & bones began to calcify, skeletal muscles exhibit spontaneous contradictions. Since 4th week heart beats & blood circulates. Heart & liver large forms prominent ventral bulge. Amnion bubble surrounding fetus umbilical cord is attached to the chorion. Fetal period period of growth, no form change but increase in size (esp. inner organs) and greatest weight increase occurs at 3rd trimester. 1st growth influenced by maternal hormones (passing through placenta) and later fetal hormones influence growth. Months 3&4 head slows in growth & hair develops, cartilage replaced by bone, distinguish sex, can hear heartbeat, ~6 inches/~6 ounces. Months 5-7 fetal movement felt, fetal position, eyelids open, ~12 inches/~3 pounds. Months 8&9 per week weight gained, fetus rotates (head toward cervix), ~7. 5 pounds/~20. 5 inches. Prevents new follicles from maturing, maintain endometrium. Source of pregnancy hormones progesterone & estrogen.

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