PSYC 271 Chapter Notes - Chapter 3: Dura Mater, Pia Mater, Autonomic Nervous System

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Central nervous system (cns) located within the skull and the spine. **remember the difference by afferent (a=arrive, approach) & efferent (e=exit, escape)** The sympathetic and parasympathetic nerves synapse on other second-stage neurons that carry the signal the rest of the way: sympathetic synapse at a substantial distance from their target organs, parasympathetic synapse on very short second-stage neurons. Important to remember that sympathetic ns is activated in threatening situations; changes indicative of psychological arousal. Parasympathetic goal is to conserve energy and indicative of psychological relaxation. Each autonomic target is regulated by opposing sympathetic and parasympathetic input. Most pns nerves come from spinal cord, but there are 12 cranial nerves from the brain that include purely sensory nerves. The central canal is a channel that runs length of spinal cord. The cerebral ventricles (4) include the two lateral, third ventricle and fourth ventricle.

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