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The Detrusor Muscle is a layer of the Urinary Bladder wall which is itself made up by three layers. The Detrusor Muscle is smooth muscle fibers arranged in spiral and circuar bundles.
1 Urine is stored in the bladder. 2  The sphincter muscles relax. 3  The bladder muscle (detrusor) contracts. 4  The bladder is emptied through the urethra and urine is removed from the body. The primary receptors in the bladder neck are alpha-adrenergic. 2  Sympathetic stimulation of these alpha receptors, via fibers in the hypogastric nerve, contributes to urinary continence. 3  The external sphincter is histologically different from the detrusor and internal sphincter. 4  It is striated muscle.