BSCI 201 Study Guide - Cerebral Peduncle, Arachnoid Mater, Optic Nerve

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Divisions & their functions: pns- cranial/ spinal nerves, ganglia, sensory receptors. Chapter 14- nervous system (ganglia) axons myelinated by schwann cells: cns- brain and spinal cord (nuclei) oligodendrocytes. Tract- bundle of axons in cns wrapped by ct. Microglia- acts as phagocyte (ingest/ o destroy foreign matter, defensive cells) o neurons o neurons (facilitate capillary- nerve exchanges) o fluid. Schwann cells- myelinate/ insulate o extensions of the neurons o. Fascicle covered by perineurium: unipolar- 1 short process divides into peripheral and central processes (extend from cell body, bipolar- two process attached to cell body (receptors of. Axon covered by endoneurium eye, ear, and olfactory mucosa: multipolar- many processes issue from cell body (all classified as dendrites except for a single axon) Resting membrane potential- difference in electrical charges produced. Threshold/ action potential/ nerve impulse- stimulus great enough to depolarize initial segment of axon generated. Repolarization- interior of membrane becomes more negative than exterior.