Divisions of the Nervous System
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Central nervous system
The central nervous system consists of the brain and the spinal chord
Peripheral nervous system
The peripheral nervous system consists of the somatic nervous system (SNS) and the autonomic nervous system (ANS)
Somatic nervous system
The somatic nervous system (SNS) controls the body’s skeletal muscles. It contains sensory and motor neurons Sensory neurons take impulses from sense organs to the CNS Motor neurons take impulses from the CNS to muscles and glands
Autonomic nervous system
The autonomic nervous system (ANS) consists of the sympathetic and parasympathetic systems These two are antagonistic (act in opposite ways)
ANS sympathetic system
The sympathetic system speeds up heart rate and breathing rate while slowing down peristalsis and production of intestinal secretions
ANS parasympathetic system
The parasympathetic system changes these in the opposite way - slows downs heart rate and breathing rate while speeding up peristalsis and production of intestinal secretions