Question

The nerve plexus located between the two layers of the muscularis externa is the _____and its function is_____.

A) Myenteric plexus; coordinating smooth muscle contractions in the digestive tract
B) Submucous plexus; regulating blood flow and nutrient absorption in the intestinal wall
C) Autonomic plexus; controlling voluntary muscle movements in the digestive system
D) Sympathetic plexus; modulating sensory perception and pain signals in the muscular layers

Answer 1

The correct answer is option A. The myenteric plexus, situated in the muscularis externa, controls the rhythm and force of contractions in the digestive tract, ensuring efficient food propulsion by peristalsis. It contrasts with the submucosal plexus, which regulates secretions and muscle reactions to food.

Step-by-step explanation:

The nerve plexus located between the two layers of the muscularis externa is the myenteric plexus, and its function is coordinating smooth muscle contractions in the digestive tract.

The myenteric plexus, also known as the plexus of Auerbach, lies within the muscularis externa layer of the alimentary canal and is primarily responsible for the rhythmical and forceful contractions of the muscles.

This activity of the myenteric plexus is a critical aspect of the motility through the digestive system, as it allows for the propulsion of food by a process called peristalsis. In contrast, the submucosal plexus or plexus of Meissner is found in the submucosal layer and regulates the activity of glands and smooth muscle, playing a role in regulating digestive secretions and the reaction to the presence of food.