organization of the nervous system

central nervous system (CNS)

brain + spinal cord

peripheral nervous system (PNS)

12 parts of central nerves, 31 pairs of spinal nerves, all nerve branches

what are 2 subdiv PNS

afferent n.s,efferent div

afferent n.s

carries sensory information from receptors to CNS

what are receptors

detect stimulate

interoreceptors

inside, monitor by internal environment

exteroreceptors

outside, monitor external environment

efferent div

carries motor output/command +effectors (muscle)

what are 2 subdivisions of efferent of N.S

somatic N.S, Autonomic N.S

somatic N.S

skeletal muscle (visionary)

what are the 2 sub div in autonomic n.s

sympathtic N.S , parasympathtic n.s

sympathetic n.s

fight or flight, active during times of stress

parasympathetic n.s

rest and digest (reproduce), active during periods of stress

autonomic n.s, parasympathic n.s——>

cardiac + smooth muscle