Detrusor muscle

Detrusor muscle
Urinary bladder
Details
OriginPosterior surface of the body of the pubis
InsertionProstate (male), vagina (female)
ArteryInternal pudendal artery, inferior vesical artery
NerveSympathetic - hypogastric n. (T10-L2) Parasympathetic - pelvic splanchnic nerves (S2-4)
ActionsSympathetic relaxes, to store urine Parasympathetic contracts, to urinate
Identifiers
Latinmusculus detrusor vesicae urinariae
TA98A08.3.01.014
TA23413
FMA68018
Anatomical terms of muscle

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