Palmar Interossei (Hand)

Written by Oliver Jones

Last updated January 31, 2023 • 6 Revisions •

The palmar interossei are intrinsic muscles of the hand. There are three palmar interossei muscles (although some texts describe a fourth muscle at the base of the proximal phalanx of the thumb).

  • Attachments: Each interossei originates from a medial or lateral surface of a metacarpal, and attaches into the extensor hood and proximal phalanx of same finger.
  • Actions: Adduction of the digits. Assists in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints.
  • Innervation: Ulnar nerve.
  • Blood Supply: Palmar metacarpal arteries

Fig 1
The dorsal and palmar interossei of the hand.

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