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Chapter 10

Chapter 10. Integumentary System (Skin). Skin: 3 Layers 1. Epidermis Thickness varies based on region Stratified Squamous epithelium Many flat layers of cells Basal (Bottom Layer) produces new cells, oldest cells on top layer of skin. Dead skin cells are “shed” (dander)

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Chapter 10

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  1. Chapter 10

  2. Integumentary System (Skin) • Skin: 3 Layers • 1. Epidermis • Thickness varies based on region • Stratified Squamous epithelium • Many flat layers of cells • Basal (Bottom Layer) produces new cells, oldest cells on top layer of skin. Dead skin cells are “shed” (dander) • Keratin= water proofing quality • Melanin (coloring), Albinism = absence of coloring

  3. Integumentary System (Skin) • Skin: 3 Layers • 2. Dermis / Corium • Blood and lymph vessels • Nerve fibers (pain!) • Accessory organs • Connecting Tissue • Fibroblasts, collagen, histiocytes, mast cells, histamine, heparin, perception

  4. Integumentary System (Skin) • Skin: 3 Layers • 3. Sub Q / hypodermis • Connective tissue • Fat • Adipocytes = fat cells that produce lipids

  5. Skin: Appendages • Glands • Hair, wool, fur • Feathers • Scales • Claws, hooves, nails • Beaks • Horns/ Antlers • Horns: grow continuously • Antlers: Shed each season • Cornification: Skin-> horns/keratin

  6. Vestigial Appendages • Vestigial: rudimentary structures, seldom used for survival, “left overs” from evolution • Dewclaws: rudimentary bones • Dogs: Digits 2 and 4 • Front and back legs. Back dew claw normally removes • Chestnuts: medial surface of (horse) legs • Ergots: tuft of hair on the fetlock joint

  7. Common Procedures • Biopsy: removal of LIVING tissue for examination • Incisional • Excisional: removal of entire tumor • Culture: growing microbes in a predetermined media for study • Skin Scrape: microscopic examination of the skin for presence of mites • Intradermal Testing: injection of test substances under the skin to test for body reaction (allergies)

  8. Common Procedures • Cauterization: destruction of tissue using electrical current/heat/ chemicals • Lance: open to allow for drainage

  9. Common Ailments • Abrasion: superficial cut • Abscess: localized collection of pus • Alopecia: abnormal hair loss(bald spots) • Shedding: normal hair loss • Contusion: Bruise • Dermatitis: inflammation • Allergies, fleas • Mange: skin disease caused by mites • Ulcers (decubical): sores , bed sores

  10. Lesions • Surface Lesions • Raised and discolored • Papule, macule, scale, wheal, plaque, patch, crust • Fluid-Filled lesions • Cyst, pustule, vesicle, bulla • Erosive • Ulcer, fissure

  11. Needle Activity : Wednesday

  12.  Activities  • Review • Depict (YOU MUST DRAW IT) • skin layers and anatomy • Include a Hair follicle it must be colored and labeled (like the one on this ppt) • Types of Hair • Give examples of/ on animals • Example: What type of hair are whiskers? • Draw examples of the types of injections • Intramuscular, SubQ, Intravenous,Cyntesis • Know what/when they are used

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