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Muscles: Splenius Capitis.

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Anatomy & Physiology: Muscles—Splenius Capitis.

Structure.

  • Origin: ligamentum nuchae and spinous processes of C7-T4.
  • Insertion: occipital and mastoid process.

Function.

  • Concentric action: extend head and neck; laterally flex and rotate head to same side as contracting muscle.
  • Reverse mover action: cervical and thoracic spinal extension; lateral flexion of lower cervical and upper thoracic spine; contralateral rotation of lower cervical and upper thoracic spine.
  • Eccentric action: controls/restrains/slows flexion, contralateral lateral flexion, contralateral rotation of head and neck.
  • Isometric action: stabilize head and neck.
  • Innervation: middle cervical spinal nerves.
  • Arterial supply: occipital artery.

Clinical Significance.

 

References

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

Cedars-Sinai. (2018). Vertebrae of the spine. Retrieved from https://www.cedars-sinai.org/health-library/diseases-and-conditions/v/vertebrae-of-the-spine.html

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.