Interossei (Palmar)

Not yet rated
based on ratings

Original Author(s): Oliver Jones
Last updated: October 18, 2022
Revisions: 4

Original Author(s): Oliver Jones
Last updated: October 18, 2022
Revisions: 4

format_list_bulletedContents add remove

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.