nervous1 - Nervous system overview neurons muscles Purpose...

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Purpose - to control/respond to the environment, internally or externally. Essentially, three steps (see also fig. 48.3, p. 1048): sensory --> processing (integration) --> motor output (usually) Physically, the nervous system is divided into: CNS - central nervous system (brain and spinal cord) PNS - peripheral nervous system (everything else) Some more terminology: nerve - bundle of neurons wrapped with connective tissue ganglion (plural = ganglia) - cluster of nerve (neuron) cell bodies (usually in PNS, but sometimes also considered to be in the CNS). Neurons: Neurons have three basic parts [Fig., similar to 48.4, p. 1049] : 1) cell body - contains nucleus, etc. 2) dendrites - tree like structure that take the signal from the tips (of dendrites) to the cell. 3) axons - these can be very long and take the signal from the cell body to the end of the axon. Can have a variety of shapes, depending on the location.
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nervous1 - Nervous system overview neurons muscles Purpose...

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