Fifth metacarpal bone Fifth metacarpal bone The fifth metacarpal bone (metacarpal bone of the little finger or pinky finger) is the most medial and second-shortest of the metacarpal bones. It presents on its base one facet on its superior surface, which is concavo-convex and articulates with the hamate, and one on its radial side, which articulates with the fourth metacarpal. On its ulnar side is a prominent tubercle for the insertion of the tendon of the extensor carpi ulnaris muscle. The dorsal surface of the body is divided by an oblique ridge, which extends from near the ulnar side of the base to
Bertram A. Bone Atoll, Wake Island, Johnston Atoll and Palmyra Atoll. Bone was meanwhile promoted to the rank of lieutenant colonel in May 1939. In November 1939, the 1st Defense Battalion was activated in San Diego with Bone as its commanding officer. As experienced artillery officer, Bone supervised the formation and initial training. His battalion consisted of the batteries with 5"/51 caliber guns, searchlight and aircraft sound locator and antiaircraft groups with M2 Browning and M1917 Browning machine guns and were ideal for the defense of the islands from the attack from the sea and air. At the beginning of March 1940, 2nd