Department of Zoology
Southern Illinois University at Carbondale

ZOOL 409, Lab Week 7

Lab notes offer a preview of upcoming labs and links to more information about tissues examined during lab.

• Week 7 lecture notes
• SYLLABUS (including links to all note pages)
• 409 Homepage (index of course resources)
• Dr. King's School of Medicine histology page
• Slide summary

TUESDAY and THURSDAY
Primary objectives: 

1. Examine the digestive tract (several regions) and recognize its various tissue components. 
    
   • Slide 46 -- tongue (epithelium, tastebuds, salivary glands, muscle); compare with slide 12, soft palate; 82, tonsil.
   • Slides 85, 68 (also, in some boxes, 06, 07), esophagus -- (epithelium, layers, submucosal glands).
   • Slides 40, 41, 68 -- stomach (epithelium, pits, mucosal glands, layers).
      
     The stomach is characterized by a thick, glandular mucosa, without villi.  Cardiac stomach is the upper portion of the stomach, characterized by short mucous glands in the mucosa.  Pyloric stomach is the lower portion of the stomach, characterized by longer mucous glands in the mucosa.  The body (fundus) of the stomach is characterized by gastric glands which may show up on slide of gastro-esophageal junction [the slide from dog should show cardiac stomach (immediately adjoining the esophagus), but apparently in the dog the characteristic glands of fundic stomach begin very near the esophagus].
      
   • Slides 03, 05, 24, 37, 47, 70 -- small intestine (epithelium, villi, crypts, layers, glands in duodenum, lymphoid tissue in ileum).
      
     The regions of the small intestine are very similar.  They all have villi and crypts.  They differ (subtly) in the proportion of goblet cells in the epithelium (increasing numbers of goblets as one goes down toward the colon) and in the shape of the villi.  More dramatically, the duodenum (but not other regions) have extensive mucous glands (Brunner's glands) in the submucosa, and the ileum has scattered but large masses of lymphoid tissue (Peyer's patches).
      
     
   • Slides 09, 38, 48 -- colon (epithelium, crypts, layers).
      
     The colon is characterized by a rather thin mucosa with many straight tubular crypts but no villi.  Goblet cells are extremely numerous.

• Components to identify:
  • layers
    • mucosa
      • epithelium
      • lamina propria
      • muscularis mucosae
    • submucosa
    • muscularis
      • inner circular muscular
      • outer longitudinal muscle
      • Auerbach's plexus (parasympathetic nervous tissue
    • serosa / adventitia
      • connective tissue
      • mesothelium
         
  • special cell types
    • taste buds on fungiform (or foliate) papillae of tongue
    • absorptive cells (enterocytes) in the epithelium of small intestine.
    • goblet cells in the epithelium of small and large intestine
    • several additional cell types, mostly secretory, save for week 9.
       
  • other features
    • features of surface shape
      • papillae
      • pits
      • villi
      • crypts
      • plicae
    • lymphatic features
    • lamina propria
    • lymph nodules
    • tonsils
    • peyer's patches
    • lacteals

   

Complete slide list:
01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100

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