Metacarpal bone

Metacarpal bones are a group of five long bones in the hand located between the wrist and the fingers. They are numbered from one to five, starting from the thumb side of the hand. The metacarpal bones are part of the appendicular skeleton and they contribute to the bony architecture of the hand.

Anatomy

Each metacarpal bone consists of three parts: the base, the shaft, and the head. The base is the part closest to the wrist, the shaft is the elongated, cylindrical part, and the head is the part closest to the fingers. The base articulates with the carpal bones of the wrist and the adjacent metacarpal bones. The head articulates with the proximal phalanges of the fingers.

Function

The metacarpal bones are crucial for hand movements and dexterity. They form the framework of the palm and act as a stable base for the manipulation of objects by the fingers. They also play a role in the transmission of forces from the hand to the forearm.

Clinical significance

Injuries to the metacarpal bones, such as fractures or dislocations, are common and can result in significant disability. Treatment depends on the type and location of the injury, but may include immobilization, reduction, or surgery.

See also

• Carpal bones
• Phalanges of the hand
• Hand anatomy