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Unformatted text preview: bulb. Much like in the epidermis, as new cells are formed in the bulb, older cells are pushed towards the surface and emerge as hair. The hair follicle consists of both an epithelial root sheath which is an extension of the epidermis and a connective tissue root sheath which is derived from the dermis and surrounds the epithelial root sheath. Hair receptors entwine each follicle while piloerector muscles are smooth muscles that cause goose bumps. In addition to sensation, hair is an important communicative and protective tool. Growth of terminal facial, pubic and axillary hair indicates sexual maturity and helps distribute sexual scents. Eyebrows, eyelashes and vibrissae protect the eyes and nose. Finger and toe nails are also densely packed cells filled with hard keratin. These clear, hard derivatives of the stratum corneum protect humans' fleshy and sensitive fingertips....
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- Fall '10