ZOO 3000 Lecture Notes - Lecture 10: Saltatory Conduction, Body Plan, Histology

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Structural divisions of the ns: central nervous system (cns) brain + spinal cord, peripheral nervous system (pns) peripheral nerves, ganglia. Functional divisions of the ns: somatic - sensory and motor innervation under voluntary control, except reflex arcs, autonomic involuntary motor control -- i(cid:374)(cid:374)ervatio(cid:374) of vis(cid:272)era, s(cid:373)ooth muscles, glands; sensory afferents from viscera. Nervous tissue: functions performed by neurons, cells specialized for, excitability, conductivity, communication, there are several types of neurons and connective/supportive cells in nervous tissue. The axon leaves the cns and, while in the pns, is part of a nerve (not shown) as it courses to its effectors (striated muscle). In the cns, the myelin for the axon is produced by, and is part of, an oligodendrocyte; in the pns, the myelin is produced by, and is part of, a schwann cell: neuron, cytoplasm contains nissl bodies. Cytoskeleton = a microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape.

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