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