Detrusor urinae muscle

As detrusor muscle of bladder (Latin diisocyanate, ., Expeller of the bladder ' ), the powerful system called muscle that surrounds the bladder and forms a part of this. The smooth muscle is composed of three layers ( Straten ):

• An outer longitudinal muscle layer (stratum longitudinal externum )
• A middle layer with circular ( circular) extending fiber tows (→ filament # biology) (stratum circulare ) and
• An inner, adjacent to the lamina propria longitudinal muscle layer (stratum longitudinal internum ).

During the middle circular muscle trains do not reach the bladder outlet, the longitudinal fibers converge toward the urethra ( urethra ), where the inner longitudinal muscle layer is formed from a stratum longitudinal internum and the outer circular muscle layer of a stratum longitudinal externum. Also, go individual muscle groups of the " expeller " in the support straps pubovesicale ligament and ligamentum puboprostaticum over.

A crucial role is played by the detrusor muscle of bladder urination (micturition ). Signals by the parasympathetic nervous system (via the vagus pelvinus ) leads to concentric tension of the muscular system, so that the bubble content is pressurized. In addition, the detrusor muscle is vesicae by an intrinsic nerve plexus affected, which is in the bladder wall and adjusts his tone to the filling status of the bladder.

• Urinary organ
• Smooth muscle
• Bladder