毛发分为毛干和毛根两部分。毛干是露出皮肤之外的部分,即毛发的可见部分,由角化细胞构成。组织可分为表皮、皮质及毛髓三层。毛干由含黑色素的细长细胞所构成,胞质内含有黑色素颗粒,黑色素使毛呈现颜色。黑色素含量的多少与毛发的色泽有关。毛干是表皮向外生长的特殊部位,由角朊必保所构成,其主要成分为角蛋白,占毛干总重量的85%—~90%,此外,还含有微量元素、类脂质、色素及水(10%~13%)。由外到内可分为三层。
最后一部分是毛干,这是皮肤上的毛发,也就是我们所能看见的毛发。
The last part is the shaft and this is the hair which is above the skin and is, of course, what we can see.
如你们所见,顺着头发的长度可以分为三个主要部分,分别是毛囊、毛根和毛干。
As you can see, along the length of the hair, there are three main parts called the bulb, the root and the shaft.
头发分叉是因为毛干的表层已经损坏。
Hair furcation because the surface layer of hair stem has been already damaged.
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