HAIR ANATOMY
Hair is a structure consisting mainly of keratin with a cylindrical shape and a 65-78µm diameter.
The longitudinal section shows the following regions:
- OSTIUM: the merger of the hair to the outside;
- INFUNDIBULUM: the upper segment that goes from the sebaceous gland duct to the follicle opening on the skin surface;
- ISTHMUS: the middle segment that extends from the sebaceous gland duct to the attachment of the arrector pili muscle. That’s where we find the BULGE, rich in stem cells;
- LOWER SEGMENT: it extends from the base of the hair follicle to the attachment of the arrector pili muscle.
HAIR CYCLE
The hair cycle is characterized by the following phases:
- Anagen: known as the growth phase, it lasts about 3-5 years;
- Catagen: known as the transitional phase, it lasts about 2-3 weeks;
- Telogen: known as the resting phase, it lasts about 3-4 months.
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