![掌骨[III] - 手部MRI - 轴 - e-Anatomy](https://cdn.imaios.cn/i/imaios-images/web/images/eanatomy/modules/hand-mr/images/v1/4c1c47972a830cfc35481b6a5a132f0ba3c4879edcd3813f4a8bd16a67ebe023?ar=640:670&auto=format,compress&bg=000000&fit=crop&p64=MzE1LDQ1OQ&t=5o6M6aqoW0lJSV0&tf=Tm90byBTYW5zIFND&tx=315&ty=459&w=350&wk=1&s=da7507e2d2ff89b72a32361ede6ff1b7)
掌骨[III]
Os metacarpale [III]
定义
第三掌骨（os metacarpale III；中指掌骨）略小于第二掌骨。
其底部的背侧面在桡侧有一锥形隆起，称为茎突，向上延伸至头状骨后方；紧邻其远端有一粗糙面，供桡侧腕短伸肌附着。腕骨关节面后方呈凹形，前方较平坦，与头状骨相关节。桡侧有一光滑的凹形关节面，与第二掌骨相关节；尺侧有两个小的卵圆形关节面，与第四掌骨相关节。
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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