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Muscles: Ischiococcygeus.

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Structure.

  • Origin: ischial spine.
  • Insertion: lower sacrum and upper coccyx.

Function.

  • Concentric action: support/maintain position of pelvic viscera; resists increase in intra-abdominal pressure (during forced exhalation coughing, vomiting, urination, defecation, childbirth); constrict anus, urethra, and vagina.
  • Isometric action:
  • Innervation: sacral spinal nerves S4-S5.
  • Arterial supply: inferior gluteal artery.

Clinical Significance.

More.

 

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.