Nervous System
1. Central nervous system
a. Brain
b. Spinal cord
2. Peripheral nervous system
a. Sensory or afferent division; to CNS
Receptor- CNS
b. Motor or efferent division; from CNS
CNS- muscle
b. Motor or efferent division
For an example; cold person will shivering (somatic motor system) and constriction of blood vessel ANS.
1. Somatic Nervous System; innervates skeletal muscle/ motion
2. Autonomic nervous system; involuntary motion
a. Sympathetic division; fight or flight
b. Parasympathetic division; rest and digest
Autonomic nervous system (ANS) is visceral efferent (motor) system because it concerned with internal organs or viscera.
It's primary function is to regulate visceral activities to maintain homeostasis.
Efferent (motor) nerves autonomic nervous system arise from brain and emerge at various levels between mid brain and sacpral region of spinal cord.
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