NSG 3111 Study Guide - Midterm Guide: Diarrhea, Fundal Height, Back Pain
24 Apr 2018
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3 stages of intrauterine development: ovum (conception to day 14) or pre-embryonic, embryo, fetus. 3 primary germ layers: ectoderm, mesoderm, and endoderm. Ectoderm: upper layer, gives rise to epidermis, glands, nails and hair, and peripheral nervous system, lens of eye, tooth enamel, floor of amniotic cavity. Develops into bones and teeth, muscles, dermis and connective tissue, cardiovascular system, spleen and urogenital system. Gives rise to epithelium lining of resp/digestive tracts, including the oropharynx, liver, pancreas, bladder. The endoderm forms the roof of the yolk sac. Chorion: membrane that develops from the trophoblast and contains the chorionic villi on its surface. Chorion is the covering of the fetal side of the placenta, contains major umbilical blood vessels. Becomes the covering of the umbilical cord and covers the chorion on the fetal surface of the placenta. As the embryo gets bigger, the amnion enlarges to continue to cover the fetus.
