Physiology 2130 Study Guide - Outer Plexiform Layer, Outer Nuclear Layer, Central Nervous System
11 Jun 2013
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Document Summary
Divisions of the nervous system: central nervous system (cns)- consists of the brain and spinal cord, peripheral nervous system (pns) composed of 2 subsystems. Midsagittal: down the center between the two hemispheres. Major parts of the cns: cerebrum- cerebral cortex. Two cerebral hemispheres divided by the sagittal fissure. The most primitive part of the brain. Concerned with life functions ie) respiration, body temperature. Conduit for information to and from the brain. Grey matter in brain where cell bodies are. White matter in brain where axons are. 31 segments (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal) Each has a pair of nerves (left and right: dorsal root: responsible for sensory info going in to the brain, ventral root: responsible for motor commands going out to muscles. Each segment of the spinal cord receives sensory input from a particular region of the body and supplies motor input to a similar region.
