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Figure 2
Differentiation
of the hair shaft. (A) Elongation of the inner root sheath about halfway
up the hair follicle. Sebaceous cells and bulge appear, as melanin granules
enter into the cortex. (B) Follicle growth altered to about 60 degrees to
the epidermis. Sebaceous glands form and the hair canal is made. The hair
shaft differentiates the inner root sheath of epidermal cells. (C) Sebaceous
gland becomes localized on the lateral wall of the follicle, while the hair
shaft extends into the hair canal. (D) Hair shaft extends out past the skin.
(After Philpott and Paus, 1998.) |
