Metacarpals are the five long bones that form the palm of the hand. Numbered I to V from the thumb side to the little finger side, they bridge the Carpus (wrist bones) to the Phalanges (finger bones). These bones provide foundational support for all Hand movements and are crucial for the hand's remarkable dexterity and strength.
Each metacarpal bone consists of three main parts: a base (proximal end), a shaft (body), and a head (distal end). The base of each metacarpal articulates with the carpal bones, forming the carpometacarpal Joints. The shaft is the elongated central part, providing attachment points for various Muscles that control hand and finger movements. The head, a rounded articular surface, connects with the proximal phalanges, forming the metacarpophalangeal joints, commonly known as the knuckles.
Beyond their structural role, metacarpals are vital for the biomechanics of gripping and fine motor control. Their arched arrangement facilitates effective grasping and allows for precise manipulation. Due to their exposed position, metacarpal Fractures are relatively common, particularly affecting the fifth metacarpal (a "Boxer's fracture"), often resulting from direct impact. Proper healing is essential to restore full hand function.
