Third metacarpal bone

The third metacarpal bone (metacarpal bone of the middle finger) is a little smaller than the second.Third metacarpal bone of the left hand (shown in red). Animation.Third metacarpal bone of the left hand. Close up.Palmer view of the left hand (third metacarpal shown in yellow).Dorsal view of the left hand (third metacarpal shown in yellow). The third metacarpal bone (metacarpal bone of the middle finger) is a little smaller than the second. The dorsal aspect of its base presents on its radial side a pyramidal eminence, the styloid process, which extends upward behind the capitate; immediately distal to this is a rough surface for the attachment of the extensor carpi radialis brevis muscle.