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Muscles: Lumbricals Manus.

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Anatomy & Physiology: Muscles—Lumbricals.

Structure.

  • Origin: lateral sides of tendons and flexor digitorum profundus of each finger.
  • Insertion: lateral sides of tendons of extensor digitorum on proximal phalanges of each finger.

Function.

  • Concentric action: flexes each finger at metacarpophalangeal joints and extends fingers at interphalangeal joints. Lesser: abduct and adduct fingers II-V at MCP joints.
  • Reverse mover action: extend proximal phalanges at PIP and DIP; flex metacarpals at MCP; abduct/adduct metacarpals at MCP.
  • Eccentric action: controls/restrains/slows flexion, extension, adduction/abduction of fingers II-V at MCP.
  • Isometric action: stabilizes MCP and interphalangeal joints of fingers II-V.
  • Innervation: median and ulnar nerves.
  • Arterial supply: branches of radial and ulnar arteries.

Clinical Significance.

More.

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.