Figure 2 Schematic structure of the hair root from the hair papilla to the hair shaft Hair growth is the result of the periodic activity of the cells of the germinal matrix. In the hairy scalp, various phases of the hair cycle take place simultaneously, independent of sex, and are regulat...
During theshedding (catagen) phase, the epithelial cells in the hair bulb and the and outer root sheath die in a regulated fashion (apoptosis). Differentiation of the hair shaft also stops, and the bottom of it becomes sealed into a structure called theclub. ...
hair root The part of the hair contained within the follicle, below the surface of the scalp. Dermal Vascular Plexus the network of blood vessels that nourishes the reticular dermis papillary layer upper dermal region reticular layer deepest skin layer osteoprogenitor cells bone stem cells Osteoblasts...
the external genitalia enlarge and the uterus commences its periodic activity withmenstruation. The breasts develop, and there is adepositionof body fat in accordance with the usualcontoursof the mature female. Growth of axillary (armpit) and pubic hair is more abundant, and the hair becomes thick...