adjacent_to adjacent to adjacent to submucosa muscular coat A region of muscle in many organs in the vertebrate body, adjacent to the submucosa membrane. It is responsible for gut movement such as peristalsis. An outer layer of smooth muscle surrounding a hollow or tubular organ as the bladder, esophagus, large intestine, small intestine, stomach, ureter, uterus, and vagina that often consists of an inner layer of circular fibers serving to narrow the lumen of the organ and an outer layer of longitudinal fibers serving to shorten its length[BTO]. BTO:0004838 UBERON:0006660 UMLS:C0225358 currently this class conflates a generic layer of muscle and a specific layer found lining the digestive tract (the muscularis externa), typically composed of circular and longitudinal layers (although this varies) muscular coat muscular layer muscularis muscularis externa muscularis layer muscularis propria transverse muscular fibers tunica externa tunica muscularis tunica muscularis typically smooth muscle, but there may be exceptions - in the upper esophagus, part of the externa is skeletal muscle, rather than smooth muscle. uberon layer of muscle tissue