Articles On Hair Follicle
The hair follicle is an organ found on the skin of mammals. It resides in the skin's dermal layer, and consists of 20 different types of cells, each with distinct functions. The hair follicle regulates hair growth through a complex interaction of hormones, neuropeptides, and immune cells. The structure contains several layers with separate functions for all. At the base of the follicle is the papilla, which contains capillaries, or tiny blood vessels that nourish the cells. The living part of the hair is the very bottom part surrounding the papilla, called the bulb.Hair grows throughout a finite period of hair shaft formation (anagen; ~3–5 y on average in human scalp), followed by a brief regression phase that results in the apoptosis-driven resorption of up to 70% of the hair follicle (catagen ~1–2 wk in human scalp), and by a relatively quiescent period (telogen ~3 mo).
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