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Pharmacology of colonic muscle.

The intrinsic innervation of the colon is complex since there appear to be two types ofexcitatory nerves (one cholinergic and one non-cholinergic) and two types of inhibitory nerves (one adrenergic and one non-adrenergic). Evidence for these nerve pathways, which has come from different types of experiments in vitro on strips of taenia or circular muscle cut from operation specimens, has been discussed in detail by Stockley and Bennett (1974).