Third metacarpal bone

Third Metacarpal Bone

Third metacarpal bone of the left hand (shown in red). Image via Wikimedia Commons.

The third metacarpal bone is one of the five metacarpal bones in the human hand. It is located in the central part of the hand, and it articulates with the third proximal phalanx.

Structure

The third metacarpal bone, like all metacarpal bones, consists of a base, a shaft, and a head. The base is the part of the bone that articulates with the carpal bones, specifically the capitate bone and the hamate bone. The shaft is the long, slender part of the bone, and the head is the rounded end that articulates with the proximal phalanx of the third finger.

Function

The third metacarpal bone plays a crucial role in the movement and flexibility of the third finger. It allows for the bending and straightening of the finger, and it also contributes to the overall grip strength of the hand.

Clinical Significance

Fractures of the third metacarpal bone, also known as "boxer's fractures," are common and often occur as a result of direct trauma to the hand, such as punching a hard object. Treatment typically involves immobilization of the hand and, in some cases, surgical intervention.

See Also

• Metacarpal bones
• Hand
• Carpal bones