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long, course, pigmented h airs that replace lanugo on the scalp, eyebrows, and eyelids
central axis of the hair that consists of two or three layers of cells contraining soft keratin
outermost layer of the hair shaft and root, composed of a single overlapping layer of cells containing hard keratin
mass of undifferentiated epithelial cells inside the hair bulb that produces the hair and internal epithelial root sheath
smooth muscle cells that attach to the hair follicle dermal root sheath and the papillary layer of the dermis; cause hair to stand on end
white substance rich in lipids, which oils the hair and skin surface, prevents drying, and protects against bacteria
merocrine sweat gland
gland that opens to the surface of the skin and secretes an isotonic fluid that is mostly water; involved with temperature regulation
apocrine sweat gland
gland that usually opens into a hair follicle; secretes an organic substance that is metabolized by bacteria to produce body odor
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