part_of part of enteric smooth muscle cell smooth muscle cell of small intestine non-striated muscle fiber of small intestine A smooth muscle cell that is part of the small intestine. FMA:15050 Smooth muscle cells of the small intestine form a key component of the enteric system which is imperative for gastrointestinal motility. These cells are a specialized subgroup of smooth muscle cells, specifically found in the layers of the small intestine. The small intestine represents a significant part of the digestive system and plays a crucial role in the absorption of nutrients into the bloodstream. Smooth muscle cells of the small intestine are predominantly responsible for creating the contractions and relaxations that constitute intestinal motility. They trigger these movements in a coordinated and rhythmic manner known as peristalsis and segmentation. Peristalsis is a form of longitudinal and sequential contraction that pushes food from the upper gastrointestinal tract to the lower parts. Segmentation works by squeezing the intestine randomly, thereby facilitating the mixing of food particles and increasing contact with absorptive surfaces. These two processes are critical for intestinal motility and an effective digestive process. Apart from facilitating transit of food through contractions, these smooth muscle cells play a role in controlling the diameter of the vessels and the blood flow in the small intestine by their constrictive ability. These smooth muscle cells also contribute to the structural integrity of the small intestine by forming a part of its muscularis externa and muscularis mucosae. Additionally, they interact with other cell types such as enteric neurons and interstitial cells of Cajal (ICC), forming an integrated cellular network that ensures optimal functioning of the intestinal tract. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) small intestine