Motility along the length of the GI tract, controlling the function of each segment of the GI tract and integrating signals for absorption of nutrients primarily, is innervated by which portion of the enteric nervous system?
A) Submucosal plexus
B) Vasovagal
C) Sympathetic
D) Preganglionic
Ans: A
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The enteric nervous system consists of the intramural neurons (contained in the gastrointestinal tract) of two networks—myenteric and submucosal plexus. The submucosal plexus, which lies between the submucosal and mucosal layers of the wall, is mainly concerned with controlling the function of each segment of the GI tract. It integrates signals received from the mucosal layer into control of motility, intestinal secretions, and absorption of nutrients. The ANS innervates the preganglionic parasympathetic fibers and controls vasovagal reflexes. Sympathetic innervation is mediated by intramural plexus activity.
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