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Skin anatomy chc training 2012 [compatibility mode] [repaired]


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Skin anatomy chc training 2012 [compatibility mode] [repaired]

  1. 1. Skin Body's largest organ: ~ 16% total body weight 1.2 to 2.3 m2 surface area Described as body’s “Cutaneous envelop” Protects us from the outside world
  2. 2. Epidermis Incredibly thin… thin as a piece of paper Total skin thickness is 1.5 to 4 mm Thickness of epidermis is between 0.06 – 0.1 mm ( except on palms and soles) Epidermis is made of 5 distinct cell layers - stratum corneum (Horny cell layer) - stratum lucidum (Clear cell layer) - stratum granulosum (Granular cell layer) - stratum spinosum (Prickle cell layer) - stratum Germinativum (Basal cell layer)
  3. 3. Process of Keratinization The skin is in continuous process of self- renewal Keratinization is the series of events through which the epidermis forms its protective outer sheath – the stratum corneum
  4. 4. Dermis Dermis is 20 to 40 times thicker than the epidermis Provides a flexible support structure Encloses the blood vessels, nerve and glands Dermis
  5. 5. • Apocrine sweat glands Large specialized sweat glands localized in axilla, areola, bearded regions of the face in adult males. Begin to function in puberty and respond to hormones Secrete oily colorless substance Sweat decomposed by bacteria…… Body Odour Sweat Glands
  6. 6. Protection: Physical trauma, micro-organism and Harmful UV light Regulation of body temperature Maintenance of fluid and electrolyte balance Transmission of sensations of pain, touch, pressure, warmth and cold Synthesis of vitamin D Functions of the Skin
  7. 7. Skin Lesions
  8. 8. Small solid, elevated skin lesion, usually 1 cm or less in diameter. Seen in many skin diseases like Acne Papule
  9. 9. Elevated, flat-topped lesion Usually greater than 1cm in diameter; Described as being shaped like plateau e. g.: - psoriasis Plaque
  10. 10. Solid deep seated mass in the dermis or subcutaneous tissue Produces elevation on the skin surface Can be seen in gross inspection or only on palpation. Ex.: - Nodulocystic acne Nodule
  11. 11. Transient, solid, itchy, raised area of cutaneous edema with irregular shape, different diameter and erythema. e. g.: - urticaria - insect bites Wheal
  12. 12. Elevated, thin-walled lesion; filled with serous fluid, less than 1 cm in diameter. Ex.: - Herpes simplex - Varicella - Herpes Zoster Vesicle
  13. 13. Thickened and rough epidermis Skin looks dry and leathery e .g.: - Atopic dermatitis Lichenification
  14. 14. Change in skin’s appearance following repair after skin injury. e. g.: - healed wound Scar
  15. 15. A linear and small split or crack in the epidermis and dermis. e. g.: - Cracked feet Fissure
  16. 16. Depressed lesion that is wider than a fissure but not as deep Erosion
  17. 17. Deep erosion in which all of epidermis and part of dermis are eaten away e. g.: -wound ulcer -Bed sore Ulcers
  18. 18. Reduction of skin thickness occurring at any skin layer. e. g.: - aged skin Atrophy