Lecture 1 - Intro: The Skin, Skin Care Products, and Raw Materials Flashcards
What is purpose of skin and hair?
Protection, keep in water
Skin is the largest organ. What are the basic stats?
Approx 8 pounds and 22 square feet
Define the epiderms
- biweekly renewal by maturation and exfoliation
- fed from the dermis and subcutaneous circulation
Define the dermis
actively metabolizing tissue retains structure (contains elastic fibers)
Define hair follicle
- origin of hair fibers
- epidermal tissue seated in dermis
function of epidermal cells
continually replicating and maturing into the cornified protective stratum corneum layer
function of dermal fibroblast cells
responsible for production and homeostasis of the underlying structural layer of skin by synthesis and excretion of fibrillar proteins- collagens and elastin and mucopolysaccharides (hyaluronic acid, dermatin)
function of melanocytes
production and transport of melanin granules inter- and intracellularly
function of langerhans cells
dendritic immunologic actors
function of hair follicle
produces complex hair structure in an orderly cycle from epidermal cells
function of sebaceous gland
holocrine excretory gland producing sebum for hair and skin lubrication exiting into hair shaft
function of eccrine sweat glands
secretory bodies that act to control internal temperature by secreting water while maintaining electrolyte balance
function of apocrine sweat glands
- associated with hair follicles secretes milky fluid- proteins and lipids
- may have pheromonal function, impacts body odor
function of nerve receptors
tactile, temperature, pressure stimulus response
function of Merkel’s Disk
touch, pressure (static)