Unformatted text preview: * root- portion below the skin surface that penetrates down to the dermis and subcutaneous layers. * hair follicle- two layers of cells that surround the hair root composed of the external and internal root sheaths. * Bulb- the bulbous shaped structure at the base of the follicle * papilla- indented area of the bulb where blood vessels enter the hair follicle to nourish the hair cells * matrix- that region of the bulb where new hair is produced * Growth Cycle- growth phase (three years) and resting phase (two years) * Arrector Pili Muscle- contact under stresses of fright and cold. * The hair follicle originates from the epidermis and the dermis. * The epidermis is responsible for the matrix and hair cells . * The dermis gives rise to the papilla which is composed of many blood vessels and nerves ....
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- Fall '10
- pH, Squamous cell carcinoma, Seborrheic keratosis