Anatomy and Physiology digestive slide key

Anatomy and Physiology digestive slide key - 35 mm slides...

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35 mm slides of the digestive system Slide 1: Esophagus (longitudinal section) Stratified squamous epithelium forms the most superficial layer of the organ. In the esophagus, there is relatively little lamina propria , and it is very difficult to distinguish the connective tissue of the lamina propria from that of the submucosa . This is very true of this particular slide. Within the connective tissue that underlies the epithelium, you can see small sections muscle tissue which represent the muscularis mucosae . The submucosa of the esophagus also contains mucus secreting glands, which although not depicted in this slide, are present along most of the length of the esophagus. The third and outermost layer shown in the slide is the inner circular layer of the muscularis externa . Since this is a longitudinal section of the esophagus, the orientation of the circular layer looks different compared to a cross section through the alimentary canal. Slide 2: Esophagus (longitudinal section) Stratified squamous epithelium forms the most superficial layer of the organ (stained pink). The lamina propria and submucosa lies just deep to the epithelium (stained blue). Recall that it is difficult to distinguish the lamina propria from the submucosa in the esophagus. Small sections of muscle tissue within the connective tissue represent the muscularis mucosae (stained pink). The third layer in the slide (stained pink) is the inner circular layer of the muscularis externa. Slide 3: Stomach (longitudinal section) This slide depicts three general layers of the stomach wall. The innermost layer, the mucosa , is stained dark pink and appears highly cellular. Deep to this layer is the loosely arranged connective tissue of the submucosa , followed by two portions of the muscularis externa (inner circular and outer longitudinal). Notice the arrangement of the mucosal epithelium. At higher magnification you will be able to discern gastric pits and glands. This is one of the key features that distinguishes the stomach from the rest of the GI tract.
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