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Levator Ani - want to learn more about it?

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Levator Ani

The levator ani forms the main part of the pelvic diaphragm, the cranial layer of the pelvic floor.

Anatomy

Origins and Insertions

It is made up of the following three muscles:

Puborectalis muscle - cranial view

  • Pubococcygeus muscle: runs from the pubic bone (lateral of the origin of the puborectalis muscle) to the tendinous center of the perineum, anococcygeal body and tailbone. In men, medial muscle fibers are partly connected to the prostate.

Pubococcygeus muscle - cranial view

  • Iliococcygeus muscle: extends more laterally from the fascia of obturator internus muscle to the tailbone. As a whole the levator ani builds a V-shaped structure. Both levator arms limit a triangle opening (levator hiatus) which is divided by prerectal fibers into the urogenital hiatus (ventral) and anal hiatus (dorsal). The urogenital hiatus is the pathway for the urethra and, in women, the vagina. The rectum runs through the anal hiatus.

Levator ani muscle - cranial view

Innervation

It is primarily supplied by direct branches of the sacral plexus (S3-S5). To a small degree the pudendal nerve contributes to its innervation as well.

Function

Through its tonic activity, the levator ani stabilizes the abdominal and pelvic organs on the one hand and controls the opening and closing of the levator hiatus on the other hand.

Recommended video: Levator ani muscle
Origins, insertions, innervation and functions of the levator ani muscle.

While in quiescent state, the urethra and the rectum are mechanically closed at the levator hiatus. The muscle relaxes at the beginning of urination and defecation. By this means the levator ani muscle plays a crucial role in the preservation of urinary and bowel continence.

Clinical Aspects

The levator hiatus is a potential weak spot of the pelvic floor musculature, especially in women. Through increased intra-abdominal pressure (e.g. pregnancy, obesity or even chronic cough) the pelvic floor can be impaired and damaged in the long term. This may cause a descent of the perineum (descending perineum syndrome, DPS) up to a complete prolaps of the vagina or rectum. Consequences are urinary and bowel incontinence.

Approximately 6% of the population suffer under intermittent painful muscle spasms of the levator ani (levator ani syndrome). These can occur at any time and are often accompanied by a feeling of pressure and tension in the anorectal region. To this day the etiology remains unclear. Both neuralgia of the pudendal nerve and psychosomatic components are in discussion.

Levator Ani - want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

Sign up for your free Kenhub account today and join over 852,397 successful anatomy students.

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Show references

References:

  • D. Drenckhahn/J. Waschke: Taschenbuch Anatomie, 1.Auflage, Urban & Fischer Verlag/Elsevier (2008), S.299-300
  • M. Schünke/E. Schulte/U. Schumacher: Prometheus – LernAtlas der Anatomie – Allgemeine Anatomie und Bewegungssystem, 2.Auflage, Thieme Verlag (2007), S.160-161, 178-187
  • J. Kirsch et. al.: Taschenlehrbuch Anatomie, 1.Auflage, Thieme Verlag (2010), S.434-436
  • R.Tunn/E. Hanzal/ D. Perucchini: Urogynäkologie in Praxis und Klinik, 2.Auflage, De Gruyter (2009), S.29-36
  • H. Rohde: Lehratlas der Proktologie, 1.Auflage, Thieme Verlag (2006), S.183-184

Author & Layout:

  • Achudhan Karunaharamoorthy
  • Christopher A. Becker

Illustrators:

  • Puborectalis muscle - cranial view - Liene Znotina
  • Pubococcygeus muscle - cranial view - Liene Znotina
  • Levator ani muscle - cranial view - Liene Znotina
© Unless stated otherwise, all content, including illustrations are exclusive property of Kenhub GmbH, and are protected by German and international copyright laws. All rights reserved.

Related Atlas Images

Muscles of the pelvic floor

Rectum and anal canal

Levator ani muscle level

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