Extensor Digitorum (ED)

Authors
Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Left Humerus (Anterior view)
Figure 2: Muscles that move the Forearm

Transverse cut of the Hand1

Transverse cut of the Hand
Figure 3: Muscles of the lower leg
Reading list
  • Extensor digitorum and Extensor indicis Muscles
  • MMT
Muscle Origin Insertion Innervation Action
Extensor digitorum Lateral epicondyle of Humerus 2-5th Dorsal digital expansion Radial n.
C7 - C8		 Wrist: Extension
2-5 MCP, PIP, DIP: Extension

Origin

  • Lateral epicondyle of humerus (Common head of ED, EDM, ECU)

Insertion

Dorsal digital expansions of 2-5 digits

Innervation

Posterior Interosseous N. (C7, C8)

Action

  • Wrist: Extension
  • MCP, PIP, DIP 2-5: Extension/abduction

Notes

1.
Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/
2.
Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details
3.
Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.
4.
Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.
5.
Weinstock D. NeuroKinetic Therapy: An Innovative Approach to Manual Muscle Testing. North Atlantic Books; 2010.
6.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.

Citation

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