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Abstract Hearts of mice were fixed in osmium tetroxide, embedded in Epon, sectioned for electron miscroscopy and stained with uranyl acetate. Various regions of these hearts were examined for neuromuscular relationships. Unmyelinated nerve bundles with partial Schwann cell investment, frequently are present within the perivascular spaces of capillaries and arterioles in the myocardium of all regions studied. Neuromuscular junctions are located in the myocardium of the right atrium, the inter‐ventricular septum and the outer ventricular walls. Neuromuscular junctions seem to be absent from the myocardium of the apex. Previously reported neuro‐effector relationships within various tissues are discussed in relation to the findings of this study.
J. C. Thaemert (Tue,) studied this question.