| First metacarpal bone | |
|---|---|
_01_palmar_view_with_label.png) First metacarpal of the left hand (shown in red). Palmar view. | |
 The first metacarpal (Left) | |
| Details | |
| Identifiers | |
| Latin | os metacarpale I |
| FMA | 23899 |
| Anatomical terms of bone | |
The first metacarpal bone or the metacarpal bone of the thumb is the first bone proximal to the thumb. It is connected to the trapezium of the carpus at the first carpometacarpal joint and to the proximal thumb phalanx at the first metacarpophalangeal joint.