Metacarpal bone

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metacarpal bone

One of the metacarpal bones, five long bones (numbered I to V, beginning with the bone on the radial or thumb side) forming the skeleton of the metacarpus or palm; they articulate with the bones of the distal row of the carpus and with the five proximal phalanges.

Synonym: os metacarpale. Any bone of the hand between the wrist and fingers.