It's gonna be a hairline metacarpal fracture.

就是掌骨轻微骨裂。

It's a minor break in the fifth metacarpal.

第五掌骨有一点小骨折。

Clean fracture of the metacarpal bone.

掌骨干净骨折。

But the underlying structures of the humerus, radius and ulna, and metacarpals, are shared.

但是肱骨、桡骨和骨以及掌骨的基础结构是共享的。

Broken knuckles, also known as metacarpal fractures, are fairly common, leading to the term “boxer’s fracture” or “brawler’s fracture”.

骨折， 也称为掌骨骨折， 相当常见，导致术语“拳击手骨折”或“斗殴者骨折” 。

These muscles include the flexor digitorum profundus which flexes the fingers at the interphalangeal joints, and the extensor digitorum which hyperextend them at the metacarpal phalangeal joint.

前臂肌群包括深屈肌（在间处使手屈曲）及伸肌（在掌处使手过伸）。

Finally, both the ulnar and median nerves innervate the lumbricals, which are 4 muscles that extend the fingers at the interphalangeal joints, and keep them flexed at the metacarpal phalangeal joints.

最后，神经和正中神经都支配蚓状肌，这四条蚓状肌能使间的手伸直，同时掌保持屈曲位。