Epithelial lining changes to stratified squamous Palatine tonsils Located in

Epithelial lining changes to stratified squamous

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Epithelial lining changes to stratified squamousPalatine tonsilsLocated in posterior wall of middle portion of pharynx (lateral walls of fauces)Commonly removed in tonsillectomy during childhoodLingual tonsilsLocated at base of tongue (posterior
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PHARYNXLaryngopharynxInferior to oropharynx, posterior to larynxContinuous with both esophagus and larynx
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LARYNX (VOICE BOX)Positioned at anterior midline of neck at the level of C4-C6Attaches to hyoid bone superiorly, continuous with trachea inferiorlyPrimary function: sound productionSecondary functions: provide open airway and prevent food/fluid from entering trachea
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LARYNX (VOICE BOX)Made up of 9 separate cartilagesUnpairedEpiglottis: most cephalic, closes glottis (laryngeal inlet) – opening between larynx, esophagus – during swallowingThyroid cartilage: largestCricoid cartilage: ring, connects thyroid cartilage to tracheaPairedArytenoid, corniculate, and cuneiform cartilages Vocal cords (true): mucosal folds containing vocal ligaments (with elastic fibers)
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TRACHEA (WINDPIPE)Descends from larynx into mediastinumFramework is 16-20 rings of hyaline cartilage (C-shaped) joined by fibroelastic CTFlexible but doesn’t collapse during breathingOpen, posterior portion has trachealis muscle (lack of rigidity allows esophagus to expand during swallowing), which decreases trachea diameterInner lining is mucous membrane and CTCarina: cartilage plate where trachea splits into primary bronchi
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BRONCHI AND BRONCHIAL SUBDIVISIONSBronchial tree: system of respiratory passages that branches into lungsBronchi (conducting zone)Main bronchi (R,L) – aka primary bronchiBranches off tracheaRuns obliquely through mediastinum and into hilus (medial depression) of lungRight side is wider, shorter, and more vertical than left side
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BRONCHI AND BRONCHIAL SUBDIVISIONSBronchi (conducting zone)Secondary (lobar) bronchi3 on the right, 2 on the left – supply each lobe of lungTertiary (segmental) bronchiDivide repeatedly into smaller and smaller bronchiBronchioles: tubes smaller than 1 mm in diameterTerminal bronchioles are smallest (<0.5 mm in diameter)
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BRONCHI AND BRONCHIAL SUBDIVISIONSChanges in tissue composition along the wallsSupportive CT changesCartilage rings are replaced by plates as main bronchi enter lungsCartilage ceases to exist at bronchiolesEpithelial tissue changesPseudostratified simple columnar simple cuboidal (terminal and respiratory bronchioles)Cilia disappears
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  • Spring '08
  • Pfeifer
  • BRONCHIAL,  Other,  Mouth

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