PHGY 209 Lecture Notes - Lecture 2: Myelin, Neural Plate, Common Carotid Artery
12 Jan 2018
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Document Summary
Gray matter: cerebral cortex (gray): 2-3mm of cell bodies nuclei of neurons; where neurons are all located. A collection of cell bodies with a common function. Nucleus has a distinct boundary a center does not. Organization of nerve cells into tissues and organs. All cell bodies and axons are grouped together into masses or bundles of neural tissue known as either white or matter. Gray matter: consists of groups of cell bodies and unmyelinated axons. White matter: consists of collections of myelinated and unmyelinated axons. Nerves: are bundles of myelinated axons that link ns. Tracts: bundles of axons that share common origins, functions, destination. Why is white matter white? axons have myelinated sheaths wrapped around them it"s fatty tissue that insulates the axon to improve the conduction of the action potentials down the axons. In multiple sclerosis affects the myelination; causes the axons not to transmit info as well, degrades their ability to send impulses well.
