Dorsal Interossei (Hand)

Written by Oliver Jones

Last updated January 31, 2023 • 5 Revisions

The dorsal interossei are intrinsic muscles of the hand. They are located superficially on the dorsum of the hand, and can be palpated between the metacarpal heads.

  • Attachments: Each interossei originates from the lateral and medial surfaces of the metacarpals. They attach into the extensor hood and proximal phalanx of each finger.
  • Actions: Abduction of the digits. Assists in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints.
  • Innervation: Ulnar nerve.
  • Blood Supply: Dorsal metacarpal arteries

Fig 1
The dorsal and palmar interossei of the hand.

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