Cosmetology Chapter 3

Arrector Pilli Muscle

small, involuntary muscle in the base of the hair follicle that gives goosebumps

Barrier functions

complex of lipids that keep the skin moist by preventing water evaporation and guards against irritants penetrating the skins surface and to help the pH

broad-spectrum sunscreen

sunscreen product that has been shown to protect from burning, skin cancer, and premature again

protects against UVA and UVB radiation

collagen

fibrous, connective tissue made from protein that gives the skin form and strength

dermal papillae

membranes of ridges and grooves that attach to the epidermis

dermatologist

physician who specialized in diseases and disorders of the hair, skin, and nails

dermatology

medical branch of science that deals with the study of skin and its nature, structure, functions, disease, and treatment

dermis

(derma, curium, cutis, true skin)

underlying or inner layer of the skin

elastin

protein base similiar to collagen that forms elastic tissue

dermal-epidermal junction

top of the papillary layer where it joins the epidermis

epidermis

outermost and thinnest layer of the skin, made from five layers

eumelanin

type of melanin that is dark in skin color

hair papillae

cone-shaped elevations at the base of the hair follicle that fit into the hair bulb

filled with tissue that contains blood vessels and other cells necessary for hair growth and follicle nourishment

keratin

fibrous protein of cells that is also the principal component of skin, hair, and nails

melanin

tiny grains of pigment produced by melanocytes deposited into cells from the stratum germination layer of the epidermis is and the papillary layer of the dermis

melanocytes

cells that produce the dark skin pigment called melanin

motor nerve fibers

fibers of the motor nerves that are distributed to the arrector pilli muscles attached to the hair follicles

carry impulses from the brain to the muscle

papillary layer

outer layer of the dermis, under the epidermis

pheomelanin

type of melanin that is red or yellow in color

reticular layer

deeper layer of the dermis that supplies the the skin with oxygen and nutrients