Dorsal Interossei of the Hand

Authors
Affiliations

Nathaniel 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

Muscle Origin Insertion Innervation Action
Dorsal interossei (hand)

Origin

  • 1st: 1-2nd metacarpals1
  • 2nd: 2-3rd metacarpals1
  • 3rd: 3-4th metacarpals1
  • 4th: 4-5th metacarpals1

Adjacent side of 2 adjacent metacarpals

Insertion

  • 1st: 2nd DDE, 2nd proximal phalanx (radial side)1
  • 2nd: 3rd DDE, 3rd proximal phalanx (radial side)1
  • 3rd: 3rd DDE, 3rd proximal phalanx (ulnar side)1
  • 4th: 4th DDE, 4th proximal phalanx (ulnar side)1

Base of prox phalanges and ext expansions of digits 2-4

Innervation

Deep Br. of Ulnar N. (C8, T1)1

Action

  • 2-4th MCP: Flexion1
  • 2-4th PIP, DIP: Extension, Abduction1

Notes

1.
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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