The enteric nervous system. Left:Enteric nervous system of the small intestine shows that enteric neurons are organized in two nerve plexuses, the submucosal plexus and myenteric plexus, with other plexuses including the deep muscular, periglandular,and villous plexus. (Redrawn with permission from Costa M et al. Histochemistry of the enteric nervous system. In: Johnson LR, ed. Physiology of the Gastrointestinal Tract, 2nd ed. Raven Press, 1987.) Right:The enteric nervous system includes sensory neurons, interneurons, and motor neurons. Complete reflex arcs exist within the enteric nervous system
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