Innervation of heart cells in culture by an endogenous source of cholinergic neurons.

Abstract
Hearts of embryonic mice 9 days in utero had an endogenous source of cholinergic neurons which survived in dispersed cell cultures. These neurons were electrically excitable, had ultrastructural characteristics of cholinergic embryonic neurons and functionally innervated heart cells in culture. The nature of the innervation described Was muscarinic cholinergic.