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| 1. | acne | skin condition due to infected sebaceous glands |
| 2. | albinism | genetic disorder that affects the skin, in which there is no melanin production |
| 3. | anagen | active phase of the hair growth cycle |
| 4. | apocrine sweat gland | type of sweat gland that is associated with hair follicles in the armpits and genital regions |
| 5. | arrector pili | smooth muscle that is activated in response to external stimuli that pull on hair follicles and make the hair "stand up" |
| 6. | basal cell | carcinoma cancer that originates from basal cells in the epidermis of the skin |
| 7. | basal cell | type of stem cell found in the stratum basale and in the hair matrix that continually undergoes cell division, producing the keratinocytes of the epidermis |
| 8. | bedsore | sore on the skin that develops when regions of the body start necrotizing due to constant pressure and lack of blood supply; also called decubitis ulcers |
| 9. | callus | thickened area of skin that arises due to constant abrasion |
| 10. | catagen | transitional phase marking the end of the anagen phase of the hair growth cycle |
| 11. | corn | type of callus that is named for its shape and the elliptical motion of the abrasive force |
| 12. | cortex | in hair, the second or middle layer of keratinocytes originating from the hair matrix, as seen in a cross-section of the hair bulb |
| 13. | cuticle | in hair, the outermost layer of keratinocytes originating from the hair matrix, as seen in a cross-section of the hair bulb |
| 14. | dermal papilla | (plural: dermal papillae) extension of the papillary layer of the dermis that increases surface contact between the epidermis and dermis |
| 15. | dermis | layer of skin between the epidermis and hypodermis, composed mainly of connective tissue and containing blood vessels, hair follicles, sweat glands, and other structures |
| 16. | desmosome | structure that forms an impermeable junction between cells |
| 17. | eccrine sweat gland | type of sweat gland that is common throughout the skin surface; it produces a hypotonic sweat for thermoregulation |
| 18. | eczema | skin condition due to an allergic reaction, which resembles a rash |
| 19. | elastin fibers | fibers made of the protein elastin that increase the elasticity of the dermis |
| 20. | eleiden | clear protein-bound lipid found in the stratum lucidum that is derived from keratohyalin and helps to prevent water loss |
| 21. | epidermis | outermost tissue layer of the skin |
| 22. | eponychium | nail fold that meets the proximal end of the nail body, also called the cuticle |
| 23. | external root sheath | outer layer of the hair follicle that is an extension of the epidermis, which encloses the hair root |
| 24. | first-degree burn | superficial burn that injures only the epidermis |
| 25. | fourth-degree burn | burn in which full thickness of the skin and underlying muscle and bone is damaged |
| 26. | glassy membrane | layer of connective tissue that surrounds the base of the hair follicle, connecting it to the dermis |
| 27. | hair bulb | structure at the base of the hair root that surrounds the dermal papilla |
| 28. | hair follicle | cavity or sac from which hair originates |
| 29. | hair matrix | layer of basal cells from which a strand of hair grows |
| 30. | hair papilla | mass of connective tissue, blood capillaries, and nerve endings at the base of the hair follicle |
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