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Hurry! Last Chance for a FREE Endura Coat Skin - Lifetime Guarantee

Don't miss out on this amazing offer! Get a free Endura Coat for a lifetime of waterproof, washable, self-repairing skin. Learn about your integumentary system now!

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Hurry! Last Chance for a FREE Endura Coat Skin - Lifetime Guarantee

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  1. Hurry, Hurry, Hurry!!! Last chance to get your FREE, yes absolutely FREE, one of a kind . . . Endura Coat!

  2. The Amazing Endura Coat is . . . • Waterproof – without any special treatment • Stretchable – yet always returns to shape • Washable – ordinary soap and water • Permanent press - will not wrinkle easily • Self-repairing - small tears, rips, and burns • And GUARANTEED to last a LIFETIME (with reasonable care)

  3. And This Amazing Coat Is Yours, Just for Being You!!! • No hidden costs • From a reputable manufacturer who’s been around an eternity. • It’s made of all natural products that can be economically and aesthetically regenerated. And it is yours, absolutely free, if you act now . . . What is it you ask??? Why it’s . . .

  4. Your Skin!!!

  5. Chapter 5 Integumentary System • Skin • Epidermis • Dermis • Hypodermis • Associated skin structures • Skin Cancer • Burns

  6. Epidermal Layers • Stratum Basale (Germinativum) • Stratum Spinosum • Stratum Granulosum • Stratum Lucidum (only in “thick” skin) • Stratum Corneum

  7. Layers of the Epidermis: Stratum Basale (Basal Layer) • Deepest epidermal layer firmly attached to the dermis • Consists of a single row of the youngest keratinocytes • Cells undergo rapid division, hence its alternate name, stratum germinativum

  8. Layers of the Epidermis: Stratum Spinosum (Prickly Layer) • Cells contain a weblike system of intermediate filaments attached to desmosomes • Melanin granules and Langerhans’ cells are abundant in this layer

  9. Layers of the Epidermis: Stratum Granulosum (Granular Layer) • Thin; three to five cell layers in which drastic changes in keratinocyte appearance occurs • Keratohyaline and lamellated granules accumulate in the cells of this layer

  10. Layers of the Epidermis: Stratum Lucidum (Clear Layer) • Thin, transparent band superficial to the stratum granulosum • Consists of a few rows of flat, dead keratinocytes • Present only in thick skin

  11. Layers of the Epidermis: Stratum Corneum (Horny Layer) • Outermost layer of keratinized cells • Accounts for three quarters of the epidermal thickness • Functions include: • Waterproofing • Protection from abrasion and penetration • Rendering the body relatively insensitive to biological, chemical, and physical assaults

  12. Layers of the Epidermis Figure 5.2b

  13. Dermis • Two Layers • Papillary Layer (20%) • Dermal ridges • Reticular Layer (80%) • Cleavage Lines of Tension

  14. Layers of the Dermis: Papillary Layer • Papillary layer • Areolar connective tissue with collagen and elastic fibers • Its superior surface contains peglike projections called dermal papillae • Dermal papillae contain capillary loops, Meissner’s corpuscles, and free nerve endings

  15. Layers of the Dermis: Reticular Layer • Reticular layer • Accounts for approximately 80% of the thickness of the skin • Collagen fibers in this layer add strength and resiliency to the skin • Elastin fibers provide stretch-recoil properties

  16. Hypodermis • Subcutaneous layer deep to the skin • Composed of adipose and areolar connective tissue

  17. Lines of Cleavage

  18. Appendages of the Skin • Epidermal derivatives • Glands • Sweat • Sebaceous (oil) • Nails • Hair • Hair follicles

  19. Sweat Glands • Different types prevent overheating of the body; secrete cerumen and milk • Eccrine sweat glands – found in palms, soles of the feet, and forehead • Apocrine sweat glands – found in axillary and anogenital areas • Ceruminous glands – modified apocrine glands in external ear canal that secrete cerumen • Mammary glands – specialized sweat glands that secrete milk

  20. Sebaceous Glands • Simple alveolar glands found all over the body • Soften skin when stimulated by hormones • Secrete an oily secretion called sebum

  21. Hair • Filamentous strands of dead keratinized cells produced by hair follicles • Contains hard keratin which is tougher and more durable than soft keratin of the skin • Made up of the shaft projecting from the skin, and the root embedded in the skin • Consists of a core called the medulla, a cortex, and an outermost cuticle • Pigmented by melanocytes at the base of the hair

  22. Hair Function and Distribution • Functions of hair include: • Helping to maintain warmth • Alerting the body to presence of insects on the skin • Guarding the scalp against physical trauma, heat loss, and sunlight

  23. Hair Function and Distribution • Hair is distributed over the entire skin surface except: • Palms, soles, and lips • Nipples and portions of the external genitalia

  24. Hair Follicle • Root sheath extending from the epidermal surface into the dermis • Deep end is expanded forming a hair bulb • A knot of sensory nerve endings (a root hair plexus) wraps around each hair bulb • Bending a hair stimulates these endings, hence our hairs act as sensitive touch receptors

  25. Hair Follicle Figure 5.5a

  26. Hair Follicle Figure 5.5c

  27. Types of Hair • Terminal – coarse, long hair of eyebrows, axillary, and pubic regions • Evident more at puberty • Vellus – pale, fine body hair found in children and the adult female • Often seen in anorexics • Hirsutism is condition associated with “hairiness” of females with adrenal or ovarian tumors • Hair growth ~2.5mm/wk (varies w/ age, sex, and body region) • Growth Phase (months to years) – Regressive/Resting Phase (1-3 months), then matrix reactivated and the old hair sheds (head 6-10+ yrs.) (eyebrow 3-4 mos.)

  28. Hair Loss/Thinning (alopecia) • Male Pattern Baldness – DHT and genes • High fever • Surgery • Emotional trauma • Pregnancy/Lactation • Excess Vit A • Antidepressants • Anticoagulants • Chemotherapy • Anabolic steroids

  29. Structure of a Nail • Scalelike modification of the epidermis on the distal, dorsal surface of fingers and toes Figure 5.6

  30. Skin Functions • Protection – • Chemical – melanin, acid mantle, human defensin, cathelicidins • Physical – keratinization, glycolipids • Biological –Langerhans cell, dermal macrophages, DNA & heat • Regulate Body Temp • Sensation • Metabolic Function • Blood Reservoir • Excretion

  31. Skin Cancers • Basal Cell Carcinoma • Most common – least malignant • Squamous Cell Carcinoma • Ulcerative – can be malignant • Melanoma • Fewest cases - most malignant • ABCD(E)

  32. Burns • Rule of “9’s” • First Degree – erythema – 2-3 days healing • Second Degree – blisters – 3-4 wks healing • Third Degree • loss includes dermis • not painful • grafts

  33. 3rd Degree Burn Prognosis • Fluid loss with protein and electrolytes • CV shock, renal shutdown • Nutrient needs • Protein for repair, glucose to provide energy • Infection • 24h, then mass sepsis

  34. Critical Criteria • 2nd and 3rd Degree Burns • >25% of body with 2o • >10% of body with 3o • 3o of face, hands or feet.

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