Autonomic Nervous System 1

Sympathetic NS effect

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Location of preganglionic neuron cell bodies (parasymphatetic)

• T1 - L2 segments of spinal cord

• S2-S4 segments of spinal cord

• Cranial nerves nuclei III, VII, IX, X (brainstem)

Location of ganglia from effector organ (sympathetic)

• away

• near

Length of Postganglionic neurons (parasympathetic)

• short

• long

Pre-G neu. synapse with (sympathetic)

• many post-G neu. of MORE than 1 organ

• post-G neu. of SINGLE effector organ

Sympathetic NS

• T1-L2 segment of spinal cord

• length post-G neu. long

• location of ganglia from eff. organ is near

• pre-G neu. synapse with MANY post-G neu. more than 1 eff. organ

Parasympathetic NS

• rest & digestion

• length post-G neu. is short

• fight or flight

• post-G neu. of a SINGLE eff. organ

Principal neurotransmitters

(at postganglionic neuron

terminals) - sympathetic

• adrenaline

• noradrenaline

• acetylcholine

Principal neurotransmitters

(at postganglionic neuron

terminals) - parasympathetic

• adrenaline

• acetylcholine

Afferent neuron:

• relaying sensory information into the central nervous system to control visceral function

• relaying information from the CNS to the viscera or muscle for control