The hair root is composed of three structures:
The follicle - is the living tissue from which your hair grow.
The bulb – it a thickened club-shape that is located in the lower part of the hair root.
The papilla – is located at the bottom portion of the follicle and it contains the blood supply to keep the hair alive. Within the hair papilla is a rich blood and nerve supply that contributes to the growth and regeneration of the hair.
HAIR GROWTH CYCLES
GROW, REST, SHED & REPEAT!
Hair grow in a series of cycles
As normal, healthy hair grows, each follicle repeats these cycles through three stages, from active to inactive.
Follicles have all the same structure and cycle phases:
Growth (Anagen) phase
Transitional (Catagen) phase
Rest (Telogen) phase
The average growth of healthy hair on the scalp is about 12.7 - 25.4mm (½ - 1 inch) per month.
At any given time, as much as 90% of the hair on your head is growing.
The remaining hair are in the transition or resting phase.