BIOB34H3 Lecture Notes - Central Nervous System, Myelin, Peripheral Nervous System

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20 Mar 2013
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Chapter 12: organization of the nervous system. Central nervous system (cns: brain and spinal cord, integrating and command center. Nervous tissue made up of: neurons, cells that receive and transmit electrical signals, neuroglia (glial cells, supporting cells of cns and pns. Called a nerve in pns: wrapped in ct coverings (as in skeletal muscle, endoneurium wraps each fiber, perineurium wraps groups of axons called fascicles, epineurium wraps entire nerve. Called a tract in cns: structural classification of neurons. Multipolar neurons: many dendrites, one axon, most neurons of the brain and spinal cord. Bipolar neurons: one dendrite, one axon, in retina of eye, inner ear, olfactory (smell) neurons. Unipolar neurons: one short process from cell body branches into two processes, sensory neurons, peripheral process has sensory receptor, central process enters cns, functional classification of neurons. Sensory (afferent) neurons: conduct signals toward cns from skin, sensory organs, muscles, joints, viscera, unipolar, cell bodies in ganglia.

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