Anatomy and Cell Biology 3319 Chapter Notes -Epithalamus, Central Canal, Cerebral Cortex

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Be able to describe the stages of development of the nervous system. Determine the embryonic origins of adult brain structures. The mesoderm begins to differentiate see sept 12 embryology. 17 days: neural tube being formed in a caudal direction from primitive node: have tri-laminar layer and form neural plate. 19 days: start to get groove: neural fold and beginning of neural tube, mesoderm starts to differentiate and form somites (go along the length of embryo) 20 days: have neural crest cells that start to migrate and leave ectoderm to move down where the mesoderm is: neural groove continues to deepen and neural folds get closer together. No sensory, cant feel pain, won"t live for long: caudal/tail fails to close spina bifida. May not be able to walk: take folic acid (b vitamins) during pregnancy to reduce neural-tube defects. 28 days: nervous system develops from the dorsal ectoderm, which invaginates to form the neural tube and the neural crest.

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