Detrusor muscle

Detrusor Muscle is a layer of the urinary bladder wall made of smooth muscle fibers arranged in longitudinal and circular bundles. The detrusor muscle remains relaxed to allow the bladder to store urine, and contracts during urination to release it.

Anatomy

The detrusor muscle is found in the wall of the bladder. It is sandwiched between two other layers: the inner mucosa with transitional epithelium and the outer serosa. The middle layer of the bladder wall is the detrusor muscle. It is composed of smooth muscle fibers, which are arranged in a series of spiral, longitudinal, and circular bundles.

Function

The primary function of the detrusor muscle is to store and expel urine from the body. When the bladder is filling with urine, the detrusor muscle remains relaxed. This allows the bladder to expand and accommodate the increasing volume of urine. During urination, the detrusor muscle contracts. This increases the pressure within the bladder and forces urine out of the body through the urethra.

Clinical Significance

The detrusor muscle can be affected by a number of medical conditions. These include Detrusor overactivity, Detrusor underactivity, and Detrusor sphincter dyssynergia. Detrusor overactivity is characterized by involuntary detrusor contractions during the filling phase which the patient cannot suppress. Detrusor underactivity is characterized by a contraction of reduced strength and/or duration, resulting in prolonged bladder emptying and/or a failure to achieve complete bladder emptying within a normal time span. Detrusor sphincter dyssynergia is a urodynamic observation characterized by a detrusor contraction concurrent with an involuntary contraction of the urethral and/or periurethral striated muscle.

See Also

• Urinary bladder
• Urethra
• Micturition

Detrusor muscle Resources
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