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Transcript of THE SKIN
-Skin can become darker due to exposure to light EPIDERMIS There are three main layers of the skin. The epidermis, the dermis, and the hypodermis. The epidermis has 5 layers. STRATUM BASALE STRATUM SPINOSUM DERMIS STRATUM GRANULOSUM STRATUM LUCIDUM STRATUM CORNEUM There are 3 types of tissue in this layer that are present throughout, not in layers. COLLAGEN ELASTIC TISSUE RETICULAR FIBERS HAIR -hair root, hair shaft, hair follicle, bulb, matrix, arrector pili SUDORIFEROUS GLANDS Also know as sweat glands, there are 4 types of these glands. MEROCRINE GLANDS -secrets through pores to cool the body APOCRINE GLANDS -secrets in area of armits and pubic region CERUMINOUS GLANDS -secrets cerumen (earwax) into the ear canal to prevent entrance of foreign bodies. MAMMARY GLANDS -produces milk that is secreted through the nipples of the breasts. SEBACEOUS GLANDS -secretes sebum (oil) into hair follicles and sometimes through skin surfaces NAILS -keratinized epithelial cells
-the lunula is the area of new nail growth
-the matrix produces new nail cells -protection
-temperature regulation INSULATION Heat escapes our bodies in 4 ways:
-Evaporation AGING -Skin becomes less elastic, dry, fragile, and thinner.
-Fat is being loss under the surface in your cheeks, temples, chin, nose, and around your eyes. UV RADIATION -Damage is done to certain fibers called elastin. Breakdown of elastin causes the skin to sag, bruise, and tear. HARLEQUIN ICHTHYOSIS -thickening of keratin layer
-massive, red, diamond shaped scales
-high risk of fatal infection in areas where skin should fold
-caused by hyperkeratosis PLAQUE PSORIASIS -occurs when immune system mistakes a normal skin cell for pathogen and sends faulty signals that causes overproduction of skin
-red or white hues of scaly patches Amber Weitzel, Paul Annulis,
Kip Bowen, and Alex Bradshaw CUTIS LAXA -connective tissue disorder
-skin is inelastic and hangs loosely
-the presentation and the mode of inheritance show considerable heterogeneity COLD SORES -tiny, fluid-filled lesions
-found around lips
-caused by herpes simplex virus (HSV-1) -The hair is composed of: ECZEMA -itchy, inflamed patches of skin
-typical in creases of elbows, knees, neck, ankles, wrists and groin
-common in babies and young children HYPODERMIS -between dermis and underlying tissue and organs
-consist of mostly adipose tissue
-storage site for most of the body's fat Function -insulation
-redirect sweat and water
Function -helps to pick up small objects
-protects distal phalanx from trauma
-used for scratching
-helps with touch