Anatomy and Cell Biology 3319 Chapter Notes -Central Nervous System, Subarachnoid Space, Lateral Ventricles
3 Mar 2014
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Neural crest cell derivatives: sensory (dorsal root) ganglia **neuroganglia outside cns, neuroepithelial cells structures of cns, neurocrest cells form ganglia, sympathetic neurons and ganglia, schwann cells, cranial nerve ganglia, glial cells. Dorsally neuroblasts become interneurons remain in cns sprout axons form white matter by growing outward along the length of cns: basal plate (future gray matter) Initial overproduction of neurons ensures that all necessary neural connections will be made: some dividing cells in subependymal zone are shown to form new neurons (past fetal period) in hippocampus & olfactory bulb. In week 5 3 primary brain vesicles give rise to 5 secondary brain vesicles: prosencephalon. Diencephalon (through-brain: mesencephalon (remains undivided, rhomencephalon. Cns: ependymal cells bear cilia that help circulate cerebrospinal fluid. Cerebral aqueduct: in the midbrain, thin tube-like central cavity, connects third & forth ventricles, fourth ventricle, lies in brain stem, dorsal to the pons & superior half of the medulla oblongata, three openings occur in the walls.
