The innervation of the heart originates from the cardiac plexuses which contain both afferent and efferent autonomic fibres. The cardiac nerves which supply the plexuses and their central connections are considered in the submenu.
Nerve fibres from the plexuses are distributed to the:
Afferent fibres from the coronary arteries, the subendocardial surfaces of the atria and ventricles, the venae cavae and the pulmonary veins, probably travel to the cardiac plexuses by both sympathetic and parasympathetic routes.
The synapse between the autonomic fibres and myocytes may be either a close proximity between the two or discrete neuromuscular junctions similar to those seen in skeletal muscle.
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