Detrusor urinae muscle
Urinary bladder
Latin	musculus detrusor vesicae urinariae
Gray's	subject #255 1233
Origin	posterior surface of the body of the pubis
Insertion	prostate (male), vagina (female)
Artery
Nerve	Sympathetic- Hypogastric N (T10-L2) Parasympathetic- Pelvic N(S2-4)
Actions	Sympathetic relaxes, Parasympathetic contracts

The detrusor urinae muscle, also detrusor muscle, muscularis propria of the urinary bladder and (less precise) muscularis propria, contracts when urinating to squeeze out urine. Otherwise, it remains relaxed to allow the bladder to fill.^[1] Related, are the urethral sphincter muscles which envelop the urethra to control the flow of urine when they contract.

[edit] Structure

The fibers of the detrusor muscle arise from the posterior surface of the body of the pubis in both sexes (musculi pubovesicales), and in the male from the adjacent part of the prostate and its capsule. These fibers pass, in a more or less longitudinal manner, up the inferior surface of the bladder, over its apex, and then descend along its fundus to become attached to the prostate in the male, and to the front of the vagina in the female. At the sides of the bladder the fibers are arranged obliquely and intersect one another.

[edit] References

1. ^ Netdoctor.co.uk - The bladder and how it works Reviewed by Dr Hilary McPherson, consultant obstetrician and gynaecologist and Dr Kate Patrick, specialist registrar

[edit] External links

• Histology at KUMC urinary/renal18-{{{2}}}

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