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Unformatted text preview: Nervous System Physical Structures-Divided into 2 components: central and peripheral-Central components are the brain and spinal cord (run right down the longitudinal axis-Nervous system evolved when humans were quadrupeds; brain and spinal cord were along the top of the body (dorsal part); now, limbs are peripheral, brain is superficial-Information has to go from the brain to the body; need a system that connects central nervous system to body (the peripheral system innervates organs and muscles, plus incoming information from sensory systems or touch receptors for various receptors set into system)-Central nervous system: composed of brain and spinal cord (1) Brain : has 3 different regions --> cerebral hemispheres, cerebellum, and the brain stem . Different animals on different parts of evolutionary tree have some of these components, none, some less evolved; humans have most evolved system; brain stem includes more ancient parts of system; cerebellum is a specialized region that integrates particular types of functions (a) Cerebral hemispheres : left and right hemispheres functionally/ anatomically connected together, but can be seen as separate brains altogether; brain can be divided into 4 functional regions found in both hemispheres called lobes *(frontal (primarily movement, also associated with higher cognitive functions), parietal (receives information from the sensory receptors on surface of the body; somatic sensory system), occipital (vision), and temporal (audition and speech formation/recognition))...
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- Spring '11