CUTICULE is the external
layer of a strand of hair which is formed of hardened
protective cells. It is without pigment and arranged
much like the shingles on a roof, intertwined and
overlapping.These thick cells collectively give hair
is under the scalp and directly related to the hair
volume.The fibrous cells of the cortex contain keratine
(the principle ingredient in hair), and melanin (the
pigment that gives hair its color).
THE MEDULLA is
the innermost center, composing 0 to 10% of the volume.
In the case of very fine hair, the medulla is absent.
THE ROOT is the living part of the hair anchored in
the scalp. At the tip of the root, a slightly larger
area known as the bulb bears a thick, whitish appearance
when one plucks a strand of hair.
is the curved and empty area at the base of the bulb.
It connects the hair to the head. Here, the blood
vessels and nerves meet and the hair receives its