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Detrusor muscle

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

Detrusor muscle
Illu bladder.jpg
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
TA A08.3.01.014
FMA 68018
Anatomical terms of muscle

In older adults over 60 years in age, the detrusor muscle may cause issues in voiding the bladder, resulting in uncomfortable urinary retention.[2]

StructureEdit

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.

The 3 layers of muscles are arranged longitudinal-circular-longitudinal from innermost to outermost.

ReferencesEdit

  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
  2. ^ Stoffel, JT (September 2017). "Non-neurogenic Chronic Urinary Retention: What Are We Treating?". Current urology reports. 18 (9): 74. doi:10.1007/s11934-017-0719-2. PMID 28730405. 

External linksEdit