Parasympathetic nervous system

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4 Terms

1
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What is the layout of the ANS?

The parasympathetic ganglion is very close to the target organ

The preganglionic nerve releases acetylcholine that binds to a nicotinic receptor

The postganglionic nerve releases acetylcholine that binds

to an muscarinic receptor.

2
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What does acetylcholine released from postganglionic fibres bind to?

  • Acetylcholine released from postganglionic fibres bind to muscarinic (M) acetylcholine receptors

  • Several subtypes of receptors exist, especially M1, M2 and M3

M1 - CNS effects

M2 - slows heart rate

M3 - contracts bladder and gastro-intestinal tract increases saliva secretion

3
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How many of the 12 cranial nerves carry parasympathetic nerve fibres?

4

4
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What are sacral parasympathetic nevres?

Sacral parasympathetic nerves importantly

innervate the bladder and lower gastrointestinal tract to control micturition and defaecation.