Midterm Flashcards
Layers of the skin
Epidermis, dermis, subcutaneous later
Structure of the hair
Arector pili muscle, sebaceous gland, hair follicle, hair root, hair Padilla, dermal blood vessel
Follicular canal
Is lined with epidermal tissue. These epidermal cells produce the follicle & hair matrix.
Hair root
Anchors hair to skin cells. Part of the hair that lies within the follicle at its base, where the hair grows
Hair bulb
Swelling at the base of the follicle that provides the hair with nourishment
Hair papilla
Cone shaped elevations at the base of the follicle that fit into the hair bulb. Filled with tissue that contains the blood vessels& cells necessary for hair growth & follicle nourishment
Hair shaft
Portion of the hair that exgend or projects beyond the skin.
Sebaceous gland
Secretes the waxy substance called sebum, which lubricates the skin and hair
Arrestor pili muscle
Small, involuntary muscles in the base of the hair follicle that cause goose flesh when appendage contracts sometimes called goosebumps &papllae
Types of hair
Lanugo-soft downy hair
Vellum hair- short fine undigested downy hair that appears on the body
Terminal hair-longer, coarse hair found on the head, brows, lashes, genitals, arms and legs
Hair growth cycle
Anagrn-catagen-telogen
Factors that affect hair growth cycle
Age, genetics, hormones, persons health, prescription drugs
Anagen phase
New hair is produced, new cells form hair and root and sheaths older hair out,
Cartagena phase
Transition phase, mitosis ceases & hair detaches itself from dermal Padilla. Follicle degenerates & collapses hair loses its inner roots sheath and becomes dryer
Telogen phase
Final or resting stage, club hair moves up the follicle & is ready to shed