GENERAL HISTOLOGY

Detailed explanation-1: -The parasympathetic nervous system (PNS) stimulates peristalsis via the myenteric plexus. The afferent (sensory) nerves of the myenteric plexus deliver information to interneurons within the plexus. Interneurons communicate with efferent nerves, stimulating an action potential (spike-wave) within smooth muscle cells.

Detailed explanation-2: -Spinal Cord Visceral organs, including the several regions of the GI tract (stomach, small intestine, and proximal large intestine), receive dual innervation from both the sympathetic and parasympathetic nervous systems.

Detailed explanation-3: -The enteric nervous system has a complex role in the small intestine, interacting with all cell types to modulate motility, secretion, pain perception, and inflammation (Fig.

Detailed explanation-4: -In general, sympathetic stimulation causes inhibition of gastrointestinal secretion and motor activity, and contraction of gastrointestinal sphincters and blood vessels. Conversely, parasympathetic stimuli typically stimulate these digestive activities.