Detrusor urinae muscle

From Wikipedia, the free encyclopedia

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

When urinating, it contracts to squeeze out urine. Otherwise, it remains relaxed to allow the bladder to fill. ^[1]

[edit] 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.

[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}}}

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