Bone
Metacarpals
Numbered supports of the palm
High-yield
The second and third metacarpal bases move relatively little. Greater movement on the ulnar side helps the palm change shape during grasping, while the first metacarpal gives the thumb its wider mobility.
Overview
Each digit has a metacarpal between its proximal phalanx and the wrist. Numbering starts at the thumb with 1 and ends at the little finger with 5. Their heads form the knuckles at the finger bases.
Reference facts
- Bone type
- Five small long bones
- Key landmarks
- Proximal base; elongated shaft; neck just behind the distal head
- Articulations
- Bases with the distal carpal row at CMC joints; heads with proximal phalanges at MCP joints
Clinical correlation
A break through the neck of the fifth metacarpal is commonly called a boxer's fracture. A blow through a clenched fist is one cause, but the name does not establish how the injury happened.
Frequently asked questions
What type of bone are the metacarpals?
The metacarpals are a five small long bones bone.
What do the metacarpals articulate with?
Bases with the distal carpal row at CMC joints; heads with proximal phalanges at MCP joints.
What are the key landmarks of the metacarpals?
Proximal base; elongated shaft; neck just behind the distal head.