the results obtained from simultaneous stimulation of vs2 and hypogastric nerves indicate that in the anal sphincteric circular muscle the release of noradrenaline from sympathetic nerves is modulated by cholinergic receptors located on noradrenergic nerve endings , muscarinic receptors which can abolish the release of noradrenaline , and probably nicotinic receptors which increase the noradrenaline release .
C0034792
cholinergic receptors
C0034826
muscarinic receptors