Base of Fifth Metacarpal Bone

Description

The base of fifth metacarpal bone is the expanded, proximal end of the bone. It is the proximal continuation of its body and contains the:

—proximal articular facet of fifth metacarpal bone;

—capitate articular facet of fifth metacarpal bone;

—fourth metacarpal articular facet of fifth metacarpal bone.

The base of fifth metacarpal bone provides an insertion site for the extensor carpi ulnaris muscle, and attachment sites for the:

—palmar metacarpal ligaments;

—dorsal metacarpal ligaments;

—palmar carpometacarpal ligaments;

—dorsal carpometacarpal ligaments;

—pisometacarpal ligament;

—ulnar collateral ligament of wrist joint.