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PERIPHERAL NERVOUS SYSTEM (STRUCTURE PNS (type of neurons (sensory…
PERIPHERAL NERVOUS SYSTEM
STRUCTURE PNS
31 pairs of nerve branching from spinal cord
12 pairs of nerve that emerge form brain
seperate from brain & spinal cord
type of neurons
sensory (afferent)
detect various sensations
transmit messages towards CNS to be intepreted by either spinal cord / brain
motor (efferent)
stimulate effectors to perform function / reflex
transmit messages away from CNS
voluntary response
consciously controlled
involuntary response
unconscionably controlled
motor nerve
somatic nervous system
PNS divisions that control voluntary response
responsible for relaying sensory & motor information between outside environment & CNS
any muscle / voluntary motor output use somatic nervous system
innervate outer sections of body
skin
skeletal muscles
autonomic nervous system
PNS division that handles involuntary movement in body
innervate internal organs
control vital function
heart rate
respiration & breathing
digestion
sympathetic
flight / response system
cause general alertness & excitement
body's way of responding to a perceived threat
parasympathetic
rest & digest response
restores the body to calm & restful state
sensory nerve