| Lab 19 Esophagus and Stomache: 1) Index 2) Introduction 3) Things to Identify 4) Upper Esophagus 5) Middle Esophagus 6) Lower Esophagus 7) Cardiac Stomach 8) Fundic Stomach 9) Pyloric Stomach 10) Stomach-Duodenal Junction 11) Comparison of Structures 12) Practical |
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Lower
Esophagus
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# 109 - Esophageal-stomach junction, monkey, h-e, l.s # 110 - Esophagus, human, h-e, 1.5 mm |
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Locate the esophageal end of this junction by identifying the thick stratified squamous epithelial lining. Find the region of abrupt change from the stratified squamous epithelium of the esophagus to the simple columnar epithelium of the stomach. In the submucosa of the esophagus, observe the esophageal glands proper. In some sections you may see a portion of the duct from these glands within the mucosal epithelium on its way to the esophageal lumen. These and Brunner's glands are the only two types of submucosal glands found in the human digestive tract. What type of muscle constitutes the muscularis externa of this region? Is there a continuity of the four layers across the esophageal-cardiac junction? In the stomach region of the slide, identify the gastric pits (which serve as ducts or outlets of the gastric glands) and the mucous surface cells of the cardiac glands. What other cell types are apparent in these glands? Compare these glands with those seen on Slides 111 (cardiac stomach), 112 (fundic stomach), 113 and 114 (pyloric stomach). Are goblet cells present in both esophagus and stomach? REFERENCES: Ross, p. 476 - 477 Gartner, p. 281, Fig. 4, p. 283, Fig. 1 DiFiore, p. 181, Fig. 12-5 Wheater, p. 252, Fig. 14.5 |
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This is an image of the lower esophagus where it meets the stomach. The blue arrow is outlining the region of the image that belongs to the esophagus. Notice the characteristic thick stratified squamous epithelium. The yellow arrow is pointing to the region of the image where the Stomach begins. The red arrow is pointing to the point of jxt between the two epitheliums. Blue arrow - Esophagus Yellow arrow - Stomach Red arrow - Jxt between the stomach and esophagus
Here is a closer look at the transition point between the two epitheliums. At this magnification you can see the stratified squamous epithelium of the esophagus (yellow arrow), and the Columnar epithelium of the stomach (blue arrows). You can also start to see the start of the Gastric Pits which are a characteristic of the mucosa of the stomach indicated by the black arrows. Yellow arrow - Stratified squamous Epithelium blue arrows- Columnar Epithelium Black arrows - Gastric Pits |
Esophogeal-Stomach Junction
Change in Epitheliums |
