Muscles / Forearms
Dorsal interossei (hand)
- Forearms
- Hand
- Deep layer
Anatomy
- Origin
- Adjacent sides of two metacarpals (bipennate)
- Insertion
- Bases of the proximal phalanges and extensor expansions of digits 2-4
- Nerve
- Deep branch of the ulnar nerve (C8-T1)
Actions
- Abduct digits 2-4 from the axial line of the middle finger ("DAB")
- Assist MCP flexion and IP extension
Notes
- 1st dorsal interosseous wasting is visible in ulnar neuropathy and T1 radiculopathy.
References (4)
- Standring S, ed. Elsevier. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed.
- Dalley AF, Agur AMR. Wolters Kluwer. Moore's Clinically Oriented Anatomy. 9th ed.
- Neumann DA. Elsevier. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed.
- Betts JG, Young KA, Wise JA, et al. OpenStax (free, openly licensed textbook). Anatomy and Physiology 2e