Metacarpal bones ***5 metacarpals, small long bones, 1 ~ 5 metacarpals from radial side to ulnar side. The metacarpal bone is also divided into two ends, the proximal end is called the basal part, which is related to a row of carpal bones at the distal end. Among them, the articular surface of 1 metacarpal base is saddle-shaped and connected with polygonal bone. The body is prismatic and slightly bent back. The distal metacarpal capitulum is spherical and related to phalanges.

Finger bone? The phalanx has two thumbs, and all the other fingers have three phalanges. From proximal to distal, it is 1 (proximal phalanx), 2nd phalanx (middle phalanx) and 3rd phalanx (distal phalanx). The phalanx is also a small long bone, and each phalanx is divided into three parts: base, body and small head. Proximal phalanx is an oval concave articular surface at the base of phalanx, which is related to metacarpal capitulum. The articular surface of the capitulum is pulley-shaped, which is called phalangeal pulley and is related to the phalangeal base in the middle section. The distal end of the distal phalanx is slightly enlarged and rough, and the nails are thicker.