The Motor Activity of the Muscularis Externa is Controlled by The

Question

The motor activity of the muscularis externa is controlled by the
A) submucosal plexus.
B) myenteric plexus.
C) migrating motor complex.
D) extrinsic neurons.
E) motilin.

Accepted Answer

The myenteric plexus, which is located between the circular and longitudinal muscle layers of the muscularis externa, is responsible for controlling the motor activity of the gut. This plexus is also known as the Auerbach's plexus and is responsible for coordinating peristalsis and regulating the tone and contractility of the smooth muscle. The submucosal plexus (Meissner's plexus) is responsible for controlling the secretory and absorptive activity of the mucosa. Migrating motor complex is a cyclical pattern of contractions that sweep through the digestive tract during the interdigestive state. Extrinsic neurons refer to neurons outside of the digestive tract that can influence gut function. Motilin is a hormone that stimulates gastrointestinal motility.