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Detrusor urinae muscle

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:
Action:
Dorlands/Elsevier	m_22/13962371

The detrusor urinae muscle is a smooth muscle^[1] of the urinary bladder wall. When urinating, it contracts to squeeze out urine. Otherwise, it remains relaxed to allow the bladder to fill. ^[2]

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Structure

The detrusor urinae muscle arises 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. They pass, in a more or less longitudinal manner, up the inferior surface of the bladder, over its vertex, 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.

References

^ Response of guinea pig smooth and striated urethral sphincter to ...
^ Netdoctor.co.uk - The bladder and how it works Reviewed by Dr Hilary McPherson, consultant obstetrician and gynaecologist and Dr Kate Patrick, specialist registrar

v • d • e List of muscles of torso
BACK	splenius (capitis, cervicis) - erector spinae (iliocostalis, longissimus, spinalis) - latissimus dorsi transversospinales: (semispinalis dorsi, semispinalis cervicis, semispinalis capitis, multifidus, rotatores) - interspinales - intertransversarii
SUBOCCIPITAL	rectus capitis posterior (major, minor) - obliquus capitis (inferior, superior)
CHEST	intercostales (external, internal, innermost) - subcostales - transversus thoracis - levatores costarum - serratus posterior (inferior, superior) - diaphragm
ABDOMEN	anterior/lateral wall: obliques (external, internal) - transversus abdominis - rectus abdominis - pyramidalis posterior wall: quadratus lumborum - psoas major/psoas minor - iliacus cremaster
PELVIS/FLOOR	levator ani (iliococcygeus, pubococcygeus, puborectalis) - coccygeus
PERINEUM	anal triangle: sphincter ani (externus, internus) superficial perineal pouch (superficial transverse perineal, bulbospongiosus, ischiocavernosus) deep perineal pouch (deep transverse perineal, sphincter urethrae membranaceae)

v • d • e Anatomy: urinary system
Abdomen	Kidneys • Ureters • Orifice of ureter
Pelvis	Urinary bladder (Uvula, Trigone, Detrusor, Apex, Neck) Urethral sphincters (External sphincter muscle of male urethra, External sphincter muscle of female urethra, Internal sphincter muscle of urethra) Urethra
Development	Development of the urinary and reproductive organs

Category: Muscles of the trunk

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Detrusor_urinae_muscle". A list of authors is available in Wikipedia.