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足底方肌，跖方肌[副屈肌]
Musculus quadratus plantae [Musculus flexor accessorius]
定义
跖方肌（M. quadratus plantae，s.m. flexor accessorius），即趾屈肌的副肌，在人体中位于趾屈肌的深面。该肌由两个肌束构成，分别起自跖面两侧，相互汇合后，附着于趾屈肌腱及其各分支。
在家养哺乳动物中，此肌仅见于肉食目动物，且以遗迹形式存在。它是一个细小的肌束，似乎仅代表人体该肌外侧部分的残余。
參考資料
Anatomie comparée des mammifère domestiques - 5th edition - Robert Barone - Vigot
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