Autonomic vs. Somatic Nervous System

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Somatic

1 Motor neuron (large, myelinated) from CNS
Neurotransmitter = ACh
Effector = skeletal muscle

Autonomic

(Sympathetic, Parasympathetic)
2 Motor neuron efferent pathway
Preganglionic neuron (myelinated)
Postganglionic neuron
Synapse at ganglia (outside CNS)
Neurotransmitter = ACh, NE
Effectors = Smooth muscle, cardiac muscle, glands
Controls internal environment
Involuntary control

Dual Innervation

Most effectors innervated by fibers from both

Antagonistic Interactions

Stimulate vs. Inhibit Example: Heart rate symp.- increases parasym. - decreases

Cooperative Effects

Example: Both must participate in controlling external genitalia

Sympathetic

Fight-or-Flight Physical or emotional activities, stress Examples: (Table 14.4)

Parasympathetic

Resting and Digesting Energy conservation, restoration Examples: (Table 14.4)

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