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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.

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