What muscle is accosastated with the intestine?

The muscularis externa is associated with the intestine.

The muscularis externa is the outermost layer of the intestine and performs a significant function in the process of digestion. It consists of two layers of smooth muscle: an inner circular layer and an outer longitudinal layer. These muscle layers work together to facilitate a coordinated series of movements called peristalsis, which propels food along the length of the intestine.

During peristalsis, the circular muscle layer contracts to narrow the intestinal lumen (inner space) behind a food bolus, while the longitudinal muscle layer contracts simultaneously to shorten the segment of intestine in front of it. This synchronized contraction creates a wave-like motion that pushes the food forward through the intestine. The rhythmic contractions of the muscularis externa are controlled by neural impulses from the enteric nervous system and are influenced by hormones and other chemical messengers.

In summary, the muscularis externa is a vital component of the intestine responsible for propelling food along the digestive tract through peristalsis, ensuring the proper digestion and absorption of nutrients.