Extensor Digiti Minimi

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)¹

Figure 2: Muscles that move the Forearm²

Mucous sheaths of the dorsal hand¹

Transverse section of distal forearm¹

Transverse cut of the Hand¹

Muscle	Origin	Insertion	Innervation	Action
Extensory digiti minimi	Lateral epicondyle of Humerus	5th Dorsal digital expansion	Radial n. C7 - C8	Wrist: Extension, Ulnar deviation 5th MCP, PIP, DIP: Extension, Abduction

Origin

• Lateral epicondyle of humerus (Common head of ED, EDM, ECU)³

Insertion

Dorsal digital expansion of 5th digit³

Innervation

Posterior Interosseous N. (C7, C8)³

Action

• Wrist: Extension, Ulnar radiation³
• 5th MCP, PIP, DIP: Extension, Abduction³

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.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.