| A | B |
|---|
| integumentary system | the skin |
| epidermis | most superficial layer of skin |
| avascular | without blood vessels |
| dermis | thicker middle layer of skin |
| stratum corneum | outermost layer of the epidermis |
| keratin | protein that waterproofs skin |
| keratinocytes | cells of the epidermis that make keratin |
| melanocytes | cells of the epidermis that make melanin |
| melanin | protein pigment that gives skin its color and protects against UV rays of the sun |
| stratum germanativum | deepest layer of the epidermis where mitosis is occuring |
| subcutaneous/hypodermal | deepest layer of the skin |
| cortex | outer layer of cells of a hair |
| root | part of the hair implanted in the dermis |
| shaft | part of the hair that extends out of the skin |
| hair follicle | pocket of epidermal tissue that extends into the dermis where the hair root is imbedded |
| arrector pili | smooth muscle attached to the hair follicle |
| matrix | site of nail formation |
| medulla | middle of the hair shaft |
| sudoriferous | sweat gland |
| sebacceous | oil gland |
| sebum | oily substance produced by the sebacceous gland |
