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Seborrheic Keratosis - root portion below the skin surface...

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Integumentary System Seborrheic Keratosis (wart) * the base of the seborrheic keratosis is flat and level with the base of the adjacent normal epidermis (ie. an exophytic appearance if the adjacent normal epidermis is included) * acanthosis (thickening of the epidermal layer; in seborrheic keratosis this results from basaloid cell proliferation. Dysplasia is absent) * hyperkeratosis (excess keratin) * epidermal cysts filled with keratin ( horn cyst ) are common, some of these cysts resulted from infoldings of the epidermis (pseudohorn cysts). * hyperpigmentation of the basaloid cells from melanin phagocytosis * solar elastosis AGE SPOTS (lentigines) Basal Cell Carcinoma Squamous Cell Carcinoma Squamous Cell Carcinoma Accessory Organs of the Skin Hair * functions to protect * thread of fused keratinized cells * anatomy * shaft - portion that projects above the skin
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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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