Nervous System

Nervous System - Nervous system: neurons in functional...

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Nervous system: neurons in functional organizations Peripheral nervous system - Somatic -info to and from muscles, joints, and skin - Autonomic - internal organs and glands 1. Sympathetic Activated when we are under a threat (fight or flight) Increases heart rate, vasoconstriction (blood vessel constriction) No longer always adaptive (psychological stress and heart disease) 2. Parasympathetic Rest and digest Lowers heart rate, vasodilation (blood vessel dilation), increase digestion, etc. Central nervous system - Spinal cord – “go between” brain and peripheral nervous system (also some basic motor reflexes) - Brainstem – connects spinal cord and brain – houses basic “programs” of survival (e.g., breathing, swallowing, urinating, mating) 1. Decerebrate cats (brainstem severed from brain above it) show some very basic survival behaviors – including aggression/attack at noises or painful stimulation, eating, some mating behaviors. But disorganized – would eat if food happened to be there, but would not search for food. 2. Automatic functions of body Reticular formation (spread throughout lower and middle brainstem) – important for sleep/wake/consciousness. Damage = coma
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This note was uploaded on 01/19/2012 for the course PSYCH 110 taught by Professor Finkel during the Spring '08 term at Northwestern.

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Nervous System - Nervous system: neurons in functional...

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