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2012-10-02 23:21:25
types tissue

Learning tissue types
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  1. Simple Squamous Epithelium
    Single row of flat scale-like cells

    Function: Permits diffusion of substances; osmosis, filtration.

    Secretes lubricating serous fluid

    Found in: Alveoli, glomeruli, endothelium of blood vessel, and serosa.
  2. Simple Cuboidal Epithelium
    Single row of cube-shaped cells with microvilli

    Function: ablorption and secretion, mucus production

    Found in: Liver, thyroid, mammary and salivary glands, bronchioles, lens capsule and kidney tubules.
  3. Simple Columnar Epithelium
    • Single row tall, rectangular narrow cells
    •  -with or without mocrovilli
    •  -oval nuclei in basal half of cell. Has goblet cells
    •  -May be ciliated or nonciliated
    • Function: Ablorption and secretion: mucus secretion 

    Found in: Lining of the GI Tract, uterus, kidney and uterine.
  4. Pseudostratified Epithelium
    • All cells are attached to the basement membrane but all cells do not reach the apical (free) surface
    •  -nuclei at varying depth and give layer a stratified look

    Function: Secretes and propels respiratory mucus 

    Found in: upper respiratory tract, epididymis
  5. Keratinized Stratified Squamous
    Multilayered epithelium covered with dead squamous cells, packed with karatin

     -epidermal layer of skin

    Function: Retards water loss and barrier to organisms
  6. Non Keratinized Stratified Squamous
    Multilayered surface epithelium forming moist, slippery layer.

    Found in: Tongue, oral mucosa, esophagus and vagina
  7. Stratified Cuboidal Epithelium
    Two or more cell layers; apical surface cells square 

    Function: Secretes sweat; produces sperm and hormones

    Found in: Seat gland ducts: ovarian follicles and seminiferous tubules
  8. Transitional Epithelium
    Found in areas subject to stretching

    Multilayered epithelium sureface cells that change from round to flat when stretched 

    • Function: allows for filling of urinary tract,
    • ureter and bladder
  9. Areolar Tissue 
    Loose arrangement of fibers and cells in abundant ground substance

    Underlies all epithelia, between muscles, passage ways for nerves and blood vessels

    Seen in serous membranes
  10. Reticular Tissue 
    Loose network of reticular fibers and cells

    Forms wupportive stroma (framework) for lympatic organs

    Found in: Lymph nodes, spleen, thymus and bone marrow
  11. Adipose Tissue 
    • Function: Energy storage, insulation, cushioning 
    •  -subcutaneous fat and organ packing
    •  -brown fat (hibernating animals) produces heat
  12. Dense Regular Connective Tissue
    • Densely, packed, parallel collagen fibers
    •  -compressed fibroblast nuclei

    Found in: tendons and ligaments

    Function: hold bones together and attach muscle to bones
  13. Dense Irregular Connective Tissue
    Densely packed, randomly arranged, collagen fibers and few visible cells

    Function: withstands stresses applied in different directions

    Found in: deeper layer of skin; capsules around organs
  14. Elastic Connective Tissue
    Found in the stroma of the lungs and in the walls of the large arteries
  15. Hyaline Cartilage
    Rubbery matrix; few dispersed collagen fibers; clustered chondrocytes in lacunae

    Function: Provide smooth surface for joint movement, supports airway, flexibility

    Found in: Ends of bones at movable joints; sternal ends of ribs, nose, supportive material in larynx, trachea, bronchi and fetal skeleton
  16. Fibrocartilage
    Large with extensive collagen fibers (never has perichondrium) 

    Function: Resists compression and absorbs shock 

    Found in: Pubic symphysis, meniscus and intervertebral discs, fontanelles
  17. Elastic Cartilage
    Lots of elastic fibers, has a perichondrium

    • Function: Provides flexible, elastic support 
    •  -external ear and epiglottis, eustation tube