Trichology Flashcards
Define Trichology
Scientific study of hair and its diseases and care
What two parts is a mature human strand of hair divided into?
The hair root and the hair shaft
Define hair root
Is the part of hair located below the surface of the epidermis
What is the hair shaft
The portion of the hair that projects above the epidermis
What are the 5 main structures of the hair root
Hair follicle, hair bulb, dermal papilla, arrector pili muscle, sebaceous gland, and sebaceous oil glands
What is a hair follicle
The tube like depression or pocket in the skin or scalp that contains the hair root
Where is the hair follicle on the body
Distributed all over the body except palms and soles
What is the hair bulb
It’s the lowest part of a hair strand. A thickened club shaped structure that forms the lower part of the hair root.
What is the dermal papillae
Contains the blood and nerve supply that provides nutrients needed for hair growth
What is the erector pili muscle
Small involuntary muscle in the base of the hair follicle
What does the erector pili muscle do
Strong emotions or a cold sensation cause it to contract which makes the hair strand straight up?
Is the sebaceous glands
Oil glands in the skin that are connected to the hair follicles. The glands secrete a fatty or oily substance called sebum. Sebum lubricates the skin
What are the three main layers of the hair shaft
Cuticle, cortex, medulla
Define hair cuticle
Outermost layer of the hair
What does the hair cuticle look like
Single overlapping layers of transparent scale like cells that look like shingles on a roof