外毛根鞘（英语：external root sheath或outer root sheath），简称外根鞘，是指由毛囊上皮根鞘外层未角化的细胞构成的结构[1]。外毛根鞘内部包裹着内毛根鞘和毛干[2]。
另见
参考资料
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