Gastric smooth muscle and neural pathways

Gastric smooth muscle and neural pathways refer to the integrated physiological system responsible for the mechanical processing and transit of food within the stomach (StatPearls: Physiology, Gastrointestinal Motility, 2023). This system comprises the gastric smooth muscle layers, the interstitial cells of Cajal (ICC) which act as electrical pacemakers, and the enteric nervous system (ENS) organized into the myenteric and submucosal plexuses (Huizinga et al., 2014, Nature Reviews Gastroenterology & Hepatology). The coordination of these components allows for gastric accommodation, trituration, and emptying, regulated by neurotransmitters such as acetylcholine, dopamine, and serotonin (NIH: National Institute of Diabetes and Digestive and Kidney Diseases). Dysfunction in these pathways, including loss of ICCs or enteric neuropathy, is a hallmark of motility disorders like gastroparesis and functional dyspepsia (PubMed: PMID 24890131). Pharmacological interventions typically target specific molecular receptors within these pathways, such as the 5-HT4 serotonin receptor or the D2 dopamine receptor, to modulate contractility (PubChem). Because this term describes a broad physiological system rather than a single molecular entity, it is not considered a discrete therapeutic target in drug discovery.

Other names

Enteric nervous systemGastric neuromuscular apparatusMyenteric plexusGastric motility pathways

Modulation of gastric motility through agonism or antagonism of neurotransmitter receptors (e.g., D2, 5-HT4, M3) or motilin receptors within the enteric nervous system and smooth muscle cells (StatPearls, 2023).