organisation of the nervous system Flashcards
afferent vs Efferent: define the terms afferent and efferent as applied to neurons, and recall specific examples of each
subdivision of PNS
sensory division and motor division
sensory divisions
somatic and autonomic
somatic sensory division
body - conscious control; controls sensory for the body wall, e.g. skin
autonomic sensory division
not under conscious control; receives sensory signals from the viscera: internal organs, smooth muscle, pupils, sweating, blood vessels, bladder, intestine, glands etc, and controls heart contraction rate
motor divisions
somatic and autonomic
somatic motor division
body - conscious control; controls motor for the body wall, e.g. skeletal muscles
composition of somatic motor division
spinal and cranial nerves
autonomic motor division
not under conscious control; regulates function of the viscera: internal organs, smooth muscle, pupils, sweating, blood vessels, bladder, intestine, glands etc, and controls heart contraction rate
autonomic subdivisions
sympathetic and parasympathetic
sympathetic vs parasympathetic nervous system
sympathetic: stress (fight or flight response); parasympathetic: relax
sympathetic actions
dilates pupils, relaxes airways, constricts blood vessels, accelerates heartbeat, stimulates sweat production, stimulates glucose production and release, inhibits digestion, stimulates ejaculation
parasympathetic actions
constricts pupils, constricts airways, slows heartbeat, stimulates bile release, stimulates digestion, stimulates erection
afferent
sensory; front of brain; anything from periphery into brain; arrive
efferent
motor; back of brain; anything from brain into perophery; exit
