====== Detrusor muscle ======

The detrusor [[muscle]], also detrusor urinae muscle, muscularis propria of the [[urinary bladder]] and (less precise) muscularis propria, is a [[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.

Related are the urethral sphincter muscles which envelop the [[urethra]] to control the flow of urine when they contract.

In older adults over 60 years in age, the detrusor muscle may cause issues in voiding the bladder, resulting in uncomfortable [[urinary retention]].

[[Urinary retention]] from [[detrusor muscle]] areflexia or hypotonia ([[autonomic neuropathy]]) from [[diabetes mellitus]].
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[[Urinary bladder dysfunction]] due to lesions in the central or peripheral nervous systems. Clinical [[manifestation]]s differ based on the location of the lesion.

● [[detrusor muscle]] hyperreflexia (detrusor overactivity (DO)): involuntary contraction of the detrusor
muscle → sensation of urgency & possible urge incontinence

● detrusor-sphincter dyssynergia (DSD): detrusor contraction with inappropriate activation of the
external urethral sphincters

● detrusor areflexia: loss of [[bladder]] tone → inability to contract sufficiently for micturition