- the only nerve that starts in the brainstem (within the medulla oblongata)
- only parasympathetic
- supplies all the organs from the neck down to the second segment of the transverse colon except the suprarenal (adrenal) glands
main functions : decreases heart rate (innervates the sinoatrial node), gastrointestinal peristalsis, sweating
Anticholinergic (inhibit the muscarinic cholinergic receptor ):
- increase heart rate
- relax the detrusor muscle, causing constipation
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