| A | B |
|---|
| Dermatology | Study of the skin |
| Esthetician | Specializes in cleansing and beautification of skin |
| Skin | The largest organ of the body |
| Healthy skin | Should be moist, soft and flexible with a slight acid reaction |
| Thickest skin location | Palms and soles of feet |
| Thinnest skin location | Eyelids |
| Epidermis | Outer skin layer (NO blood vessels/many nerve endings) |
| Stratum Corneum | The horny layer. Made of keratin and waterproof |
| Stratum Lucidum | Layer has small cells where light can pass through |
| Stratum Granulosum | Granular layer |
| Stratum Germinativum | Deepest layer. Responsible for growth. Contains melanin which protects the skin from UV rays. |
| Dermis | Inner skin layer. Contains nerves, sweat glands, papillae. |
| Papillary Layer | Contains melanin and papillae |
| Reticular layer | Supplies skin with oxygen and nutrients |
| Subcutaneous Tissue | Fatty layer. Gives smoothness and contour to the body. |
| Blood and Lymph | Helps to nourish the skin |
| Motor Nerves | Causes goosebumps |
| Sensory Nerves | Reacts to heat,cold,pain etc.. |
| Secretory Nerves | Manages secretion of sweat and oil |
| Melanin | Affects skin color, responsible for protecting us from the sun's rays. |
| Collagen | Gives skin form and strength, lack of it causes wrinkling |
| Elastin | Helps skin regain shape after being stretched |
| Sudiferous Glands | Sweat. Helps to regulate body temp. (98.6) |
| Sebaceous Glands | Oil. Lubricates skin everywhere but palms/soles of the feet. |
| UVA Rays | Aging rays |
| UVB Rays | Burning rays |
| Nicotine | Causes contraction and weakening of blood vessels |
| Alcohol | Can over-dilate capillaries, causing them to burst |
| Vitamin A | Supports overall skin health, topical form is Retin-A |
| Vitamin E | Helps protect skin from sun rays |
| Water | Composes 50-70% of body weight |
| Sun | Responsible for 80-85% of skin aging |
