Chapter 18 :
Autonomic Nervous System
complex system of nerves
controls involuntary actions.
Works with the somatic nervous system
regulates body organs
maintains normal internal functions.
SNS, PNS, and ANS
SNS and ANS are both part of the peripheral
nervous system (PNS).
SNS operates under our conscious control.
ANS functions are involuntary.
Comparison of SNS and ANS
SNS uses both somatic sensory and somatic
Somatic sensory neurons conduct stimulus
information from a sensory receptor
Somatic motor neurons innervate skeletal muscle
ANS also utilizes sensory and motor neurons.
Visceral sensory neurons provide input to activate
Visceral motor neurons innervate smooth muscle,
cardiac muscle, and glands