![掌骨[IV] - 手部MRI - 轴 - e-Anatomy](https://cdn.imaios.cn/i/imaios-images/web/images/eanatomy/modules/hand-mr/images/v1/dbffae4dda0b054a37558c987a1bf716bf619f1998b39a4cc0f509bd3193c87b?ar=640:670&auto=format,compress&bg=000000&fit=crop&p64=NDEwLDQ0Mg&t=5o6M6aqoW0lWXQ&tf=Tm90byBTYW5zIFND&tx=410&ty=442&w=350&wk=1&s=c8adaaab395b41de5a2bb3bfc6a03117)
掌骨[IV]
Os metacarpale [IV]
定义
第四掌骨（os metacarpale IV；无名指掌骨）比第三掌骨短且小。
底部小而呈四边形；其上表面有两个关节面，内侧一个较大的关节面与钩骨相关节，外侧一个较小的关节面与头状骨相关节。桡侧有两个卵圆形关节面，与第三掌骨相关节；尺侧有一个单一的凹形关节面，与第五掌骨相关节。
參考資料
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
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