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Chief Complaint: Elderly male was recently feeding tube insertion…

- - - - peristalsis
    - - holding sac where mechanical and chemical digestion continues on the bolus
    - - passageway for air and food
    - - finishes chemical digestion and absorbs most nutrients from food
    - - absorbs water and electrolytes from remaining digested material and compacts it into feces
    - - stores fecal material prior to defecation
  - - - store and concentrate bile
    - - mastication
    - - propels bolus to esophagus
  - - - neutralize acidic chyme
    - - produces bile
        
        mechanical digestion
    - - moistens ingested food into a bolus
- - - - contains blood vessels, lymphatic vessels and nerve fibers
  - - - mouth and pharynx
        
        skeletal muscle which aids swallowing
      - rest of digestive tract
        
        smooth muscle (3 layers in stomach, 2 layers in small and large intestines) and nerve fibers
        
        peristalsis and mechanical digestion by segmentation
  - - - visceral peritoneum
      - mesentery
      - adventitia
      - mesocolon
      - parietal peritoneum
  - - - laminae propria
        
        areolar connective tissue
        
        blood vessels and lymphatic vessels provide nutritients tot he epithelial layer, distribute hormones produced in epithelium and absorb end products of digestion from the lumen
        
        outside epithelium
        
        MALT: mucosa-associated-lymphoid tissue
      - muscular mucosae
        
        outer layer
        
        thin layer of smooth muscle
        
        responsible for generating local movements
      - epithelium
        
        innermost layer
        
        goblet cells
        
        secret mucus that protects epithelium from digestion
        
        simple columnar epithelium or stratified squamous epithelium
        
        endocrine cells
        
        secret hormones into blood