Structure Of The Hair/Root
The scientific study of hair and its diseases
Trichology
Middle layer of the hair, made of protein, 90% of weight.
Hair Cortex
Hair is made up of cells filled with
Keratin
Weak, broken by water
Hydrogen Bond
Growth phase, new cells are produced, grows 1/2" a month
Anagen
The part of the hair located below the surface of the epidermis
Hair Root
Arrector Pili Muscle
Major elements that make up human hair
Carbon, Oxygen, Hydrogen, Nitrogen, Sulfur
Weak, based on pH
Salt Bond
Transition period
Catagen
Hair Shaft
Medulla
Proteins join end to end to form
Amino Acids
Strong Bond, broken and bonded by chemicals
Disulfide Bond
Resting phase
Telogen
Tude like depression or pocket in the skin that contains the hair root.
Hair follicle
Outermost layer of the hair, scale like cells that look like shingles on a roof.
Hair Cuticle
Amino acids are joined by a chemical bond called
Peptide Bonds
Black or Brown pigment vs. Yellow or Red Pigment
Between growth and resting phase
Catagen
Lowest part of a hair strand/root.
Hair Bulb
Small, cone shaped elevation located at the base of the hair follicle that fits into the hair bulb; has blood and nerve supple that provides the nutrients needed for hair growth
Tiny grains of pigment in the cortex that give natural color to the hair
Melanin
Chains of protein are bonded by
Hydrogen Bonds, Salt Bonds, Disulfide Bond
Lasts until the fully grown hair is shed, 3-6 months
Telogen