It's gonna be a hairline metacarpal fracture.

就轻微裂。

It's a minor break in the fifth metacarpal.

第五有一点小折。

Clean fracture of the metacarpal bone.

干净折。

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

但、桡和以及基础结构共享。

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

指关节折， 也称为折， 相当常见，导致术语“拳击手折”或“斗殴者折” 。

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.

前臂肌群包括指深屈肌（在指间关节处使手指屈曲）及指伸肌（在指关节处使手指过伸）。

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，这四条蚓状肌能使指间关节手指伸直，同时指关节保持屈曲位。