metacarpale

The metacarpale refers to any of the five bones that form the palm of the hand. These bones are long bones, meaning they are longer than they are wide. They are numbered from one to five, starting from the thumb side of the hand and moving towards the little finger. The first metacarpal is the shortest and stoutest, articulating with the trapezium bone of the wrist and the proximal phalanx of the thumb. The second through fifth metacarpals are generally longer and more slender, articulating with the carpal bones of the wrist proximally and the phalanges of the fingers distally. Each metacarpal bone has a base, a shaft, and a head. The bases are the proximal ends that connect to the carpal bones, forming the carpometacarpal joints. The shafts are the long, cylindrical middle portions. The heads are the distal ends that articulate with the proximal phalanges, forming the metacarpophalangeal joints, commonly known as the knuckles. These joints allow for flexion, extension, abduction, and adduction of the fingers. The metacarpals play a crucial role in hand function, providing a stable framework for the palm and enabling a wide range of movements for grasping and manipulating objects.