DHE119 chapter2 Quiz2

  1. Cells:
    smallest structural unit of living matter functioning independently
  2. Four types of tissue:
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  3. Extracellular matrix:
    • mesh-like material that holds cells and tissues together
    • Made of gel-like substance and fibers
    • active structure of molecules secreted by cells that provides structural and biochemical support to surrounding
    • a component of all living tissues.
  4. Epithelial Tissue-matrix is
    scanty –thin mat- basal lamina –underlies epithelium
  5. What type of epithelium is in Skin and oral mucosa ?
    • Flat cells arranged in layers
  6. COMPOSITION of Epithelial Tissue
    PLENTIFUL cells:
    closely packed epithelial cells bound together in sheets - rest on connective tissue
  7. COMPOSITION of Epithelial Tissue
    Sparse extracellular matrix:
    small, thin mat under cellular sheets
  8. Keratinization
    process by which epithelial cells on the surface of the skin become stronger and waterproof
  9. Keratinized epithelial cells
    • no nuclei
    • Most heavily keratinized epithelium of body is on palms of hands and soles of feet
  10. Nonkeratinized ephithelial cells:
    • have nuclei
    • Cushion mechanical stress and wear
    • Softer -More flexible
    • Mucosal lining of cheeks:
    • Permits movement needed to speak, chew, and make expressions
    • Non-keratinized surfaces must be kept moist by bodily secretions to prevent them from drying out
  11. Mucosal lining of cheeks
    • Permits movement needed to speak, chew, and make expressions
    • Non-keratinized surfaces must be kept moist by bodily secretions to prevent them from drying out
  12. Epithelial Cell Junctions:
    • Cellular structures that mechanically attach a cell and its cytoskeleton to:
    • Neighboring cells
    • Basal lamina
  13. Purpose of Cell Junctions
    • Allows cells to bind together -stronger structural unit
    • SKIN-Epithelium that must withstand severe mechanical stresses have the most number of cell junctions
  14. Forms of Epithelial Cell Junctions
    • connects two neighboring epithelial cells
    • Think of snaps on a jacket
  15. Forms of Epithelial Cell Junctions
    connects epithelial cells to basal lamina
  16. Connective Tissue-
    Fills spaces between tissues and body organs
  17. Extracellular matrix of connective tissue:
    Main component in matrix is gel-like substance with a network of strong fibers
  18. Soarse cells:
    CT CELLS-sparsely distributed in extracellular matrix
  19. Cells of Connective Tissue
    cells that synthesizes the extracellular matrix and collagen, is the structural framework (stroma) for tissues, and plays a critical role in wound healing.
  20. Cells of Connective Tissue
    • Phagocytes (Cell Eaters-PAC MAN) 
    • devour dying cells- invasive microorganisms
  21. Cells of Connective Tissue
    Lymphocytes (WBC):
    Cells- immune system
  22. Connective Tissue
    DENTAL connective TISSUES:
    • Enamel is epithelial tissue
  23. ameloblasts, which produce enamel become a part of the
    reduced enamel epithelium
  24. Epithelial–Connective Tissue interface is
    • the boundary where the epithelial and connective tissue meet.
    • Wavy or smooth
  25. Wavy Boundary of Epithelial Connective Tissue Boundary includes:
    • Epithelial ridges: Deep extensions of epithelium reach down into connective tissue
    • Connective tissue papillae: Finger-like connective tissue extensions reach up to epithelium
  26. Function of WAVY Boundary
    • Enhances adhesion of epithelial tissue and connective tissue by increasing surface area of junction between two tissues.
    • Epithelium receive nourishment from CT.
    • Epithelium doesn’t have it's own Blood Supply
    • Strong junction allows skin to resist mechanical forces
  27. Gingival Epithelium:
    • Functions well in wet environment of oral cavity
    • Anatomy is similar to that of skin
  28. Three Anatomic Areas of the Gingival Epithelium?
    1.Oral epithelium

    2.Sulcular epithelium

    3.Junctional epithelium
  29. Oral Epithelium:
    • Covers outer surface- free gingiva/ attached gingiva
    • Located from the Crest of gingival margin to mucogingival junction
    • Keratinized/ Parakertinized(partially keratinized)
    • Interface-connective tissue- Wavy
  30. Sulcular Epithelium:
    • Epithelial lining of gingival sulcus
    • Extends from crest of gingival margin to coronal edge of junctional epithelium
    • Thin and nonkeratinized 
    • Permeable Fluid flows from connective tissue to sulcus
    • Smooth interface with connective tissue
  31. Junctional Epithelium
    • Forms the base of sulcus
    • Joins gingiva to tooth
    • More Cells Apical than coronal
    • 15 to 30 cells thick in coronal zone
    • Four to five cells thick in apical zone
    • Thin and nonkeratinized
    • Easiest point of entry for bacteria to invade connective tissue
    • Smooth tissue interface with connective tissue
  32. Internal basal lamina
    Thin basal lamina Between epithelial cells of junctional epithelium and tooth
  33. External basal lamina
    Thin basal lamina Between epithelial cells of junctional epithelium and gingival connective tissue
  34. ▪Dental pellicle
    • Forms immediately on a clean tooth surface
    • Protective by diffusing acid
    • Enables microbial attachment in early stages of biofilm formation
    • Lies between tooth and internal basal lamina
    • Also known as dental cuticle or acquired pellicle 
    • Forms during late stages of tooth eruption
  35. JE Attachment to Tooth
    • Attaches to tooth surface using hemidesmosomes and internal basal lamina
    • Cells of the junctional epithelium can move along the tooth surface
  36. Attachment to Underlying Gingival Connective Tissue
    • Attaches using hemidesmosomes and external basal lamina
    • Healthy junctional epithelium has a smooth tissue interface with connective tissue
  37. Function of Junctional Epithelium–Connective Tissue Interface
    • Provides a seal at base of gingival sulcus or periodontal pocket
    • Provides a protective barrier between plaque and connective tissue
  38. Function of Gingival Connective Tissue
    • Provides solidity to gingiva
    • Attaches gingiva to cementum of root and bone
  39. Components of Gingival Connective Tissue
    • Few cells (5%):
    •   Fibroblasts, neutrophils, macrophages, lymphocytes
    • Abundant extracellular matrix:
    •  55% to 65% protein fibers (collagen)
    • 30% to 35% gel-like matrix
  40. Supragingival Fiber Bundles
    Rope-like collagen fiber bundles located coronal to alveolar crest
  41. Characteristics of Fiber Bundles
    • Embedded in extracellular matrix
    • Junctional epithelium attachment to tooth is strengthened by fiber bundles
    • Provides structural support to gingival tissues
  42. Function of Fiber Bundles
    • Brace free gingiva firmly against tooth
    • Reinforce attachment of junctional epithelium to tooth
    • Provide free gingiva rigidity to withstand chewing
    • Unite free gingiva with cementum of root and boneConnect adjacent teeth to each other
  43. Classification of Fiber Groups
    • Alveologingival
    • Circular
    • Dentogingival
    • Periostogingival
    • Intergingival
    • Intercircular
    • Interpapillary
    • Transgingival
    • Transeptal
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DHE119 chapter2 Quiz2
DHE119 Chapter2 Quiz2