Hair Anatomy and Physiology
Where is hair present on the body? - Answers-- everywhere EXCEPT the palms, soles, vermillion zone,
and certain genetial parts
Where is the root of the hair? - Answers-- part embedded in the dermis
all of the part of the hair under the skin
What is the hair follicle? - Answers-- tube like sheath made of epithelial cells that form a downward
extension of the epidermis into the dermis
What is the hair bulb? - Answers-- base of the root and hair follicle
- onion-shaped
What is the hair papilla? - Answers-- the blood vessels from the dermis which are pushed into the hair
bulb
What is the pilosebaceous unit made up of? - Answers-- sebaceous gland(s), hair follicle, and small
muscle (arrector pili)
What is the hair cuticle? - Answers-- multiple layers of keratinizes, flattened cells that overlap each other
(like roof tiles) and are stuck together by intercellular cement
- translucent allowing light to penetrate the pigments
, What is the cuticle mostly made of? - Answers-- keratin
What is the function of the cuticle? - Answers-- protects cortex
- acts as a barrier
- regulates water content of hair fiber
- responsible for luster and texture
What part of the hair fiber do condiitioners target? - Answers-- cuticle
Where is the cortex? - Answers-- just below the cuticle
What does the cortex do? - Answers-- gives the hair mechanical properties (strength, elasticity,
curliness)
What is the cortex made of? - Answers-- elongated cortical cells rich in keratin and sulfur proteins
(cysteine)
- spaces of air
Where is melanin found in the hair fiber? - Answers-- cortex
Why does hair turn gray during aging? - Answers-- the amount of pigment (melanin) produced is less
- more air spaces are present
What is the medulla? - Answers-- aka the core of the hair fiber
- flat, cornified cells
- may or may not be present
Where is hair present on the body? - Answers-- everywhere EXCEPT the palms, soles, vermillion zone,
and certain genetial parts
Where is the root of the hair? - Answers-- part embedded in the dermis
all of the part of the hair under the skin
What is the hair follicle? - Answers-- tube like sheath made of epithelial cells that form a downward
extension of the epidermis into the dermis
What is the hair bulb? - Answers-- base of the root and hair follicle
- onion-shaped
What is the hair papilla? - Answers-- the blood vessels from the dermis which are pushed into the hair
bulb
What is the pilosebaceous unit made up of? - Answers-- sebaceous gland(s), hair follicle, and small
muscle (arrector pili)
What is the hair cuticle? - Answers-- multiple layers of keratinizes, flattened cells that overlap each other
(like roof tiles) and are stuck together by intercellular cement
- translucent allowing light to penetrate the pigments
, What is the cuticle mostly made of? - Answers-- keratin
What is the function of the cuticle? - Answers-- protects cortex
- acts as a barrier
- regulates water content of hair fiber
- responsible for luster and texture
What part of the hair fiber do condiitioners target? - Answers-- cuticle
Where is the cortex? - Answers-- just below the cuticle
What does the cortex do? - Answers-- gives the hair mechanical properties (strength, elasticity,
curliness)
What is the cortex made of? - Answers-- elongated cortical cells rich in keratin and sulfur proteins
(cysteine)
- spaces of air
Where is melanin found in the hair fiber? - Answers-- cortex
Why does hair turn gray during aging? - Answers-- the amount of pigment (melanin) produced is less
- more air spaces are present
What is the medulla? - Answers-- aka the core of the hair fiber
- flat, cornified cells
- may or may not be present
