Detrusor 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.
| Detrusor muscle | |
|---|---|
Urinary bladder | |
| Details | |
| Origin | posterior surface of the body of the pubis |
| Insertion | prostate (male), vagina (female) |
| Nerve | Sympathetic - hypogastric n. (T10-L2) Parasympathetic - pelvic splanchnic nerves (S2-4) |
| Actions | Sympathetic relaxes, to store urine Parasympathetic contracts, to urinate |
| Identifiers | |
| Latin | musculus detrusor vesicae urinariae |
| TA98 | A08.3.01.014 |
| TA2 | 3413 |
| FMA | 68018 |
| Anatomical terms of muscle | |
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