test #6 Flashcards
CNS
you know
PNS
composed of nerves and ganglia
nerve
a bundle of nerve fibers wrapped in fibrous connective tissue
nerve fibers
axons
ganglion
a knot like swelling
neuron cell bodies are concentrated
sensory division pns is what
also called ____
carries sensory signals from various receptors
afférent
somatic sensory division
carries signals from receptors in the skin, muscles, bones, and joints
visceral sensory division
Cary signals from the VIR of the thoracic and abdominal cavities
heart lungs stomach urinary bladder
motor division pns
also called ___
cns to gland and muscles
efferent
effectors
cells and organs that respond to commands from the cns
Somatic motor division
Cary signals to skeletal muscles
VOLUNTARY
visceral motor division
Carries signals to glands, cardiac muscle and smooth muscle
NON VOLUNTARY
sympathetic division of visceral motor
arouse body for action
(accelerating heartbeat, inhibits digestion)
parasympathetic division of visceral motor
tends to have a calming effect
(slowing the heartbeat, stimulates digestion)
myelin sheath
Spiral layer of insulation around a nerve fiber
