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Dorsal interossei of the hand
Muscle parts
None
Latin name
Musculi interossei dorsalis (manus)
Latin muscle parts
None
Group
Hand muscle – intermetacarpal group
Etymology
This muscle’s name in English is the muscle between the bones on the back of the hand. Interossei comes from the Latin terms inter meaning “between” and os meaning “bone.”The word dorsalis is from the Latin dorsum for “back.”
Origin
Each muscle arises from the adjacent surfaces of all the metacarpal bones.
Insertion
Base of the proximal phalanges and the extensor expansion of digits 2 ,3, and 4.
Action
Abduction of digits 2, 3, and 4 at the metacarpophalangeal joints; assists with flexion of the metacarpophalangeal joints; extend the interphalangeal joints.
Nerve supply
Ulnar nerve (C8 and T1)
Blood supply
The dorsal interossei have an extensive blood supply, which includes the dorsal metacarpal arteries, the palmar metacarpal arteries, the princeps pollicis artery, the radialis indicis artery, perforating branches from the deep palmar arch, and common and proper palmar digital arteries.
