General facts Of Hair :
- Hair is made up of a protein called
- The hair fiber has three cell layers:
1.An outer cuticle, the cortex
(which forms the bulk of the fiber in most
- 2. Ovariable central medulla
- It is fixed to skin through a tubular
structure called as hair follicle. A hair
follicle extends from skin surface into the
dermis (middle layer of skin).
- The hair follicle is divided into two
- The upper part consisting of the
infundibulum and isthmus
- The lower part comprising the hair bulb
and suprabulbar region
- The upper follicle is a relatively
constant structure, whereas the lower
follicle undergoes repeated episodes of
regression and regeneration during the hair
- Cells from hair bulb give rise to
different layers of hair fiber
- Many glands like sebaceous glands(oil
producing glands of skin) also open in hair
- On the scalp, and some other regions of
the skin, hair follicles are arranged in
groups of three or more follicles known as
- Every person NORMALLY has around 50
to 100 strands of hair fall in a day
Hair cycle :
Hair follicles undergo a repetitive sequence of
growth and rest known as the hair cycle;
- It consists of three stages, Anagen, Catagen
- Anagen: The period of active hair growth.
- The duration of this phase is
responsible for determining the final length
of the hair.
- Under normal circumstances 80–90% of
hair follicles on the human scalp are in
Anagen at any one time.
- Catagen: the resting stage of hair cycle
- Telogen: the shedding stage of the hair
Each hair follicle of every human being will have to go
through these stages, thus we all shall experience hair fall
normally as well.
When the shedding / hair fall is beyond
normal, treatment becomes mandatory.