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Histology

Histology. I. Introduction. A. Definitions. B. Types. 1. Epithelium. Covering / Lining and forms most Glands. 2. Connective. Fibrous with extracellular matrix. 3. Muscular. Fibrous with intracellular matrix. 4. Nervous. Packed with cellular matrix. II. Epithelial Tissue.

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Histology

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  1. Histology I.Introduction A.Definitions B.Types

  2. 1. Epithelium Covering / Lining and forms most Glands

  3. 2. Connective Fibrouswith extracellularmatrix

  4. 3. Muscular Fibrous with intracellularmatrix

  5. 4. Nervous Packed with cellularmatrix

  6. II.Epithelial Tissue A.Defining Characteristics

  7. 3. “Bound”surface underlain with Connective Tissue and basement membrane “bm” 2. Avascular 4. Not innervated 1. Densely packed cells with a “free” surface

  8. B.Functions

  9. 1.Protection from entry orexit 2. Excretory &Secretory 3. Absorptive 4. Sensory Reception 5. Separates two environments

  10. C.Classification of Epithelial Sheets

  11. 1. Based on number of cell layers a. Simple b. Pseudostratified c. Stratified 2. Based on cellular shape a. Squamous b. Cuboidal c. Columnar

  12. 3. Classes & Functions a. Simple Squamous Figure 4.3a

  13. 3. Classes & Functions b. SimpleCuboidal Figure 4.3b

  14. 3. Classes &Functions c. Simple Columnar Figure 4.3c

  15. d. Pseudostratified Figure 4.3d

  16. e. StratifiedSquamous f. StratifiedCuboidal&Columnar Figure 4.3e

  17. g. Transitional Figure 4.3f

  18. D.Classification of Epithelial Glands

  19. 1. Based on Function a. Exocrine b. Endocrine 2. Based on Complexity a. Unicellular b. Multi-cellular 3. Based on Mode of Secretion a. Merocrine b. Apocrine c. Holocrine

  20. Figure 4.4

  21. Figure 4.5

  22. Figure 4.6

  23. III.Connective Tissue A.Defining Characteristics

  24. 1. Cells embedded into matrix (ground substance and fibers) 2. Vascular supply 3. Many cell types but one resident cell 4. Innervated 5. Function depends on location andpacking of fibers

  25. B.Cell Types

  26. 1. Fibroblast 2. Macrophage 3. Plasma Cell 4. Mast cell 5. Adipocyte

  27. Figure 4.7

  28. C.Fiber Types

  29. 1. Collagen 2. Elastic (Elastin) 3. Reticular

  30. D.Classes

  31. 1. Based on Packing of Fibers (Proper) a. Loose b. Dense 2. Based on Density of Ground Substance a. Cartilage b. Bone c. Blood

  32. 1a. Proper Loose C. T.,Areolar Figure 4.8a

  33. 1a. Proper Loose C. T., Adipose Figure 4.8b

  34. 1a. Proper Loose C. T., Reticular Figure 4.8c

  35. 1b. Proper Dense C. T.,Regular Figure 4.8d

  36. 1b. Proper Dense C. T., Irregular Figure 4.8e

  37. 1b. Proper Dense C. T.,Elastic Figure 4.8f

  38. 2a. Cartilage C. T.,Hyaline Figure 4.8g

  39. 2a. Cartilage C. T., Elastic Figure 4.8h

  40. 2a. Cartilage C. T., Fibrocartilage Figure 4.8i

  41. 2b. Bone C. T., Compactvs. Cancellous(or spongy) Figure 4.8j

  42. 2c. Blood C. T. Figure 4.8k

  43. IV.Nervous Tissue A.Defining Characteristics

  44. 1. Packed cells mostly designed for rapid communication 2. Classed based on locationanddirection of impulses 3. Highly vascularized with barriers

  45. 1. Packed cells Figure 4.9

  46. 2. Location and Direction

  47. V.Muscle Tissue A.Defining Characteristics

  48. 3. Highly vascularized 2. Classed based on organization of proteins 4. Highly Innervated 1. Packed cells (called fibers) filled with contractile proteins

  49. B.Classes

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