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Smooth muscle innervation

Innervation of smooth muscle by autonomic nerve fibers that branch diffusely and secrete neurotransmitter from multiple varicosities. Unitary (visceral) smooth muscle cells are connected by gap junctions so that depolarization can rapidly spread from one cell to another, permitting the muscle cells to contract as a single unit. In multiunit smooth muscle, each cell is stimulated independently by a neurotransmitter released from closely associated autonomic nerve varicosities.