BIO SCI 75 Lecture Notes - Lecture 15: Neural Tube Defect, Neural Tube, Endometrium
Document Summary
Second/third trimester-fetal: most things form in the rst 8 weeks. If abnormalities happen in the beginning stages they are more major than in the later stages: main characteristics of the fetal period of development is rapid growth, Ner development of organs, and reshaping of body parts/organs. 5 days before blastocyst is in the uterus. ~11 days before the blastocyst fully implants into the uterus lining. Structure inside the mesoderm: day 16-18, guide for development head to tail. Ectoderm invaginates into the mesoderm: will become the spinal cord, mesoderm and somites, will form most internal organs, vertebrae, and muscles. Limb bids frow: nostrils form, week 6-7, more human like. Tail is gone: head has high forehead. Pharynegeal arches(bars: days 26-51, cleft palate-happens when the arches do not form correctly and the face does not form properly, fusion of bars is not done right. Fetus beings to move: heartbeat can able found. Blood cells begin to produce in bone marrow.
