Hair Growth
How many phases are in the growth cycle?
3
List all 3 textures
Fine, Medium, Coarse
How many elements are in a hair strand?
5
What is hair shaft?
nonliving portion of the hair that extends beyond the skin or scalp
Meaning of trichology is.....
study of hair including its diseases and care
What is lanugo hair?
short, fine hair that covers a fetus and generally sheds within a few weeks of birth.
What are the components of hair analysis?
texture, density, porosity, elasticity, growth patterns, dryness/oiliness of scalp and hair
What does COHNS stand for?
Carbon, Oxygen, Hydrogen, Nitrogen, Sulfur
What are the hair parts?
hair cuticle, cortex, medulla
Located below the epidermis (the skin's outer layer)
Hair root
Which phase involves about 90 percent of hair in the anagen phase at any time?
Telogen Phase
Describe Density
measures the number of individual hair strands on 1 sq. in.
List the element of the hair strand
carbon, oxygen, hydrogen, nitrogen, sulfur
What is hair cuticle?
hair's outermost layer
projects above the epidermis.....
hair shaft
The follicle shrinks and detaches from the dermal papilla. What am I?
Catagen phase
What are the levels of porosity?
low porosity, average porosity, high porosity
What are the cortex side bonds?
hydrogen bond, salt bond, disulfide bond, lanthionine bond
What is cortex?
fibrous protein layer of the hair
Parts of the hair root structure
hair follicle, hair bulb, dermal papilla, arrector pili muscle, sebaceous glands
Long pigmented hair on the scalp and body, is coarser than vellus hair and, except for gray hair.
Terminal Hair
What are percentages of elasticity?
average wet hair= 30 to 50 percent
dry= 20 percent
What are different hair pigments?
Eumelanin, apheomelanin
T/F: generally, coarse hair a a medulla, while fine hair does not
True
T/F: arrector & sebaceous glands are NOT attached to the hair follicle.
False