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The detrusor muscle, also detrusor urinae muscle, muscularis propria of the urinary bladder and (less precise) muscularis propria, is smooth muscle found in the wall of the bladder. The detrusor muscle remains relaxed to allow the bladder to store urine , and contracts during urination to release urine.
The muscular layer (muscular coat, muscular fibers, muscularis propria, muscularis externa) is a region of muscle in many organs in the vertebrate body, adjacent to the submucosa. It is responsible for gut movement such as peristalsis .
The lamina propria may also be rich in vascular networks, lymphatic vessels, elastic fibers, and smooth muscle fascicles from the muscularis mucosae. Afferent and efferent nerve endings can be found in the lamina propria as well. [6] Immune cells as well as lymphoid tissue, including lymphoid nodules and capillaries, may be present.
Underlying the epithelium is the lamina propria, which contains myofibroblasts, blood vessels, nerves, and several different immune cells, and the muscularis mucosa which is a layer of smooth muscle that aids in the action of continued peristalsis and catastalsis along the gut.
True diverticula involve all layers of the structure, including muscularis propria and adventitia, such as Meckel's diverticulum. [2] True diverticula are typically synonymous with traction diverticula, which describes the mechanism of formation as pulling forces external to the structure.
Invades the lamina propria or submucosa, and less than or equal to 1 cm in size T2: Invades the muscularis propria, or greater than 1 cm in size T3: Invades through the muscularis propria into subserosal tissue without penetration of overlying serosa T4: Invades visceral peritoneum (serosal) or other organs or adjacent structures
In humans, it is about one mm thick, and its surface is smooth, soft, and velvety. It consists of simple secretory columnar epithelium, an underlying supportive layer of loose connective tissue called the lamina propria, and the muscularis mucosae, a thin layer of muscle that separates the mucosa from the underlying submucosa.
Tis: Carcinoma in situ; Cancer cells are found only in the epithelium or lamina propria; T1: Growth into the submucosa; T2: Growth into the muscularis propria; T3: Growth through the muscularis propria and into the subserosa, or into tissues surrounding the colon or rectum (but not the visceral peritoneum or surrounding organs).