Tendon of third dorsal interosseous muscle - MRI finger of hand - Axial PD FS - e-Anatomy
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Tendon of third dorsal interosseous muscle

Tendo musculi interossei dorsale terti

Definition

Muhammad A. Javaid

The tendon of third dorsal interosseous muscle inserts into the ulnar side of the base of the proximal phalanx of the middle finger and its extensor hood. It functions to abduct (spread) the middle finger medially (ulnar deviation), moving it away from the hand's central axis. Additionally, via its connection to the dorsal aponeurosis (extensor hood), it assists in flexion at the metacarpophalangeal (MCP) joint and extension at the interphalangeal (IP) joints of the middle finger.

References

  • Valenzuela M, Bordoni B. Anatomy, Shoulder and Upper Limb, Hand Dorsal Interossei Muscle. [Updated 2025 Apr 27]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK536922/

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