Hair Root Structure
the study of hair, including its diseases and care
What is Trichology
the hair shaft consists of
What is the cuticle, cortex and medulla
newly formed cells mature and fill up with a fibrous protein called
What is keratin
natural hair color is the result of a pigment called
What is melanin
measures the number of individual hair strands on 1 sq. in. of scalp classified as low, medium or thick
What is hair density
The hair, skin, nails and glands are part of what system
What is integumentary system
the outermost layer of the hair strand. It softens and swells during chemical services
What is the cuticle
referred to as the COHNS elements
carbon, oxygen, hydrogen, nitrogen and sulfur
melanin that consists of brown and black pigment
What is eumelanin
refers to the hair's ability to absorb moisture
What is hair porosity
tube-like structure in the skin or scalp that surrounds the hair root and anchors the hair in the skin
What is the hair follicle
fibrous protein layer of the hair. Is responsible for hair's strength, elasticity and color and contributes to about 90% of hair's weight.
What is the cortex
three types of side bonds
hydrogen, salt and disulfide
melanin that is red to yellow in natural blonde and red shades of hair
hair's ability to stretch and return to it's original length without breaking
What is elasticity
located at the base of the follicle, contains living cells that will form the hair strand
What is hair bulb
known as the hair's pith or core. Sometimes missing from hair.
What is the medulla
thio permanent waves and thio permanent relaxers break disulfide bonds and reform the bonds with
What is thio neutralizers
refers to the amount of movement or shape of a hair strand
What is wave pattern
the brief transition period between the hair follicle's growth and resting phases, the follicle shrinks and detaches from the dermal papilla
What is the catagen phase
involuntary muscle in the dermis that attaches to the hair follicle, causing goosebumps
What is arrector pili muscle
always contains the medulla
What is beard hair
hydroxide chemical hair relaxers break disulfide bonds and convert them to
What is lanthionine bonds
the diameter of an individual hair strand classified as fine, medium or course
What is hair texture
the resting phase, the final hair cycle
What is the telogen phase