Opponens Digiti Minimi (Hand)

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: Intrinsic Muscles of the Hand¹

Muscles of the thumb²

Muscle	Origin	Insertion	Innervation	Action
Opponens digiti minimi (hand)	Hook of Hamate hand_flexor_retinaculum	5th Proximal Phalanx (ulnar border)	Ulnar n. C8 - T1	5th MCP: Opposition

Origin

• Hook of hamate³
• Flexor retinaculum³

Insertion

5th Metacarpal (ulnar border)³

Innervation

Deep Br. of Ulnar N. (C8, T1)³

Action

5th MCP: Draws anterior and rotates it towards the thumb³

Notes

1.

Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details

2.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/

3.

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