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出版社:informa healthcars

作   者:Benjamin Ascher

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Hair
The hair follicle originates from basal keratinocytes that invaginate deep into the dermis. It is part of the pilar unit which is composed of the hair follicle, sebaceous gland, and erector pili muscle (Figure 2.5). It is divided into three segments: the infundibulum, the isthmus, and the inferior segment. The hair cycle consists of the active growth phase (anagen), involutionary stage (catagen), and resting phase (telogen). The daily scalp hair growth rate averages about 0.4mm. In the adult scalp the anagen stage lasts at least 3 years, catagen phase 3 weeks, and telogen about 3 months. At any given time approximately 84% of scalp hairs are in the anagen phase, 2% in catagen, and 14% in telogen. The histologic appearance of the hair follicle changes significantly during the hair cycle.
毛发
毛囊源于深陷入深层于真皮层的基底层的角化细胞,是,是毛发的一部分(毛发由毛囊,、皮脂腺和立毛肌共同组成)毛发的一部分(图2.5)。毛囊,被分为三个部分:漏斗部,峡部和下段。毛发周期包括活跃的生长成长阶段期(生长期),过密退化阶段期(退行期)和休止期(静止期)。头发每天的平均生长速度约为0.4mm/天左右。成人头皮毛发的生长阶段期至少持续至少3年,退行期为3周,休止期大概为3个月左右。在任何时候时间内,都大约有84%的头皮毛发是在生长期,2%的是在退行期,而14%的在休止期。毛囊的组织学外观在毛发周期显著变化。