Histology #2- Tissues cont

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Anonymous
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236505
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Histology #2- Tissues cont
Updated:
2013-09-24 02:03:30
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UCVM
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Histology #2- Tissues cont
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  1. How does skin work/ what are its functions?
    • Barrier: waterproof, microbial invasion, mechanical abrasion, UV irradiation
    • thermoregulation
    • tactile sensation
    • excretion (salts)
    • nutrition (vitamin D)
    • absorption (amphibians)
    • camouflage
    • regeneration
  2. What is the basic organization of the integument
    • Layers: epidermis, dermis, hypodermis (subcutis)
    • Epidermis: cornification (hardening and waterproofing), tight junctions (a type of epithelium)
    • tethered to deeper layers (loose-->tight)
    • blood and nerve?
    • glands and appendages- epithelium extends into deeper layers
  3. What are appendages included in the integument?
    • Glands- sweat, sebaceous and anal, uropygial
    • Hair/fur- follicle (invagination of epidermis, hair bulb/root)
    • Feathers
    • nail, claw, hoof
    • horn, beak
  4. T or F- epidermis is a type of epithelium
    TRUE
  5. what cell type is the epidermis?
    • stratified squamous
    • *primarily: keratinocyte
    • -keratinocytes undergo progressive proliferation and cornifications
    • -keratinocytes contain an abundance of cytokeratins- a family of fibrous proteins that polymerize as intermediate filaments
  6. What are the 5 layers of the Epidermis?
    • S. Corneum
    • S. Lucidum
    • S. Granulosum
    • S. Spinosum
    • S. Basale

    and then basement membrane

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