Changes

==Development==

==Development==

Hair germs begin from an aggregation of keratinocytes in the stratum basale of the epidermis.  The initiating factor is the underlying dermal fibroblast cells.  The keratinocytes elongate, divide and relocate to the dermis.  Dermal fibroblasts then  form a dermal papilla beneath the hair germ.  This causes stimulation of the basal stem cells to up-regulate their cycle, producing cells that will keratinise and for the hair shaft.  2 swellings for on the shaft, one containing stem cells for follicle regeneration, the other becomes a sebaceous gland which will secrete sebum onto the hair shaft.

Hair germs begin from an aggregation of keratinocytes in the stratum basale of the [[Integumentary System - Anatomy & Physiology|epidermis]].  The initiating factor is the underlying dermal fibroblast cells.  The keratinocytes elongate, divide and relocate to the dermis.  Dermal fibroblasts then  form a dermal papilla beneath the hair germ.  This causes stimulation of the basal stem cells to up-regulate their cycle, producing cells that will keratinise and for the hair shaft.  2 swellings for on the shaft, one containing stem cells for follicle regeneration, the other becomes a sebaceous gland which will secrete sebum onto the hair shaft.

==Structure and Function==

==Structure and Function==