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

6. 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

7. 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

8. 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)

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

10. 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

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

12. Needle Activity : Wednesday

13.  Activities  Review Depict (YOU MUST DRAW IT) Types of Hair
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