Metacarpal Bone Digit 1

**Semantic type:** Anatomical Structure

**Definition:** The first and most medial of five miniature long bones located in the palm of the hand, which articulates proximally with the trapezium of the carpus at the carpometacarpal joint and distally with the thumb phalanx at the metacarpophalangeal joint.

**Synonyms:** - METACARPAL BONE 1