BIOCHEM 2B03 Chapter Notes - Chapter 4: Raphe Nuclei, Sleep Onset, Medial Forebrain Bundle
28 Sep 2013
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Subcortical focus not on the cortex; start in the periphery of the body (highly conserved), move into the subcortical central nervous system. New structures built on old (conserved) basic biological dries and emotions cannot be understood by human evolution exclusively; must look at primate predecessors; predecessor structures observed in humans, but tweaked. Structure reflects evolution homologous structures of brain in many mammals. Cortex can drive our motivation; more with maturing and learning. Impulses from more primitive structures can conflict with cortex: many peripheral nerves, sympathetic stress, fear, intense emotions, exhilaration, Great deal of tissue, goes to every organ of the body. Stress inhibits proper digestion: less blood flow to digestive tract, skin. Less blood to skin green : more blood flow to muscles, lungs. Blood to muscles dealing with primitive forms of danger (that you have to run from) or aggression: dilates pupils. Better intake of visual information; can focus.
