The neck in cross section (50x). The esophagus is lined with stratified squamous epithelium and has a scalloped lumen. The trachea is lined with pseudostratified ciliated columnar epithelium and has a smooth lumen.
Functions
Layers of the Gastrointestinal Tract
Distinguishing characteristics
of the four layers through the GI tract
Esophagus
Esophageal Stomach
Junction
Stomach
Small Intestine
Large Intestine
Liver
Pancreas is covered in the Endocrine
Lab
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Photo taken by Dr. w. Coons
The neck in cross section (50x). The esophagus is lined with
stratified
squamous epithelium and has a scalloped lumen. The trachea is
lined with pseudostratified
ciliated columnar epithelium and has a smooth lumen.
Photo taken by Dr. W. Coons
The black arrow indicates the mucosa;
the blue arrow indicates the submucosa; the black bracket indicates
the muscularis externa; the brown arrow indicates the adventitia.
Photo taken by Dr. W. Coons
200x
The black arrow indicates the mucosa; the blue arrow indicates
the submucosa; the black bracket indicates the muscularis externa.
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Photo taken by Dr. W. Coons
50x
The arrows indicate the junction of the stratified
squamous epithelium of the mucosa lining the esophagus and the simple
columnar epithelium of the mucosa of the stomach.
100x
The arrow indicates the junction of the stratified
squamous epithelium of the mucosa lining the esophagus and the simple
columnar epithelium of the mucosa of the stomach.
400x
The arrow indicates the junction of the stratified
squamous epithelium of the mucosa lining the esophagus and the simple
columnar epithelium of the mucosa of the stomach.
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Photo taken by Dr. W. Coons
The black bracket is the mucosa; the blue bracket is the submucosa;
the red bracket is the muscularis; the green arrow indicates the serosa.
(50x)
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Photo taken by Dr. W. Coons
The black bracket is the mucosa; the blue bracket is the submucosa;
the red bracket is the muscularis. (50x)
Photo taken by Dr. W. Coons
This is a villus in the mucosal layer of the SI.
The epithelium is simple
columnar. The red arrows indicate Goblet cells. The green
arrow indicates the microvilli or brush border covering the villus. (400x)
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Photo by Dr. W. Coons
The black bracket is the mucosa; the blue bracket is the submucosa;
the red bracket is the muscularis. There are no villi
in the large intestine; there are intestinal glands. (50x)
Photo by Dr. W. Coons
The black bracket is the mucosa; the blue bracket is the submucosa;
the red bracket is the muscularis. Notice the abundance of Goblet
cells in the epithelial layer of the mucosa. There are no villi
in the large intestine; there are intestinal glands.(50x)
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Photo taken by Dr. W. Coons
Liver tissue is arranged into lobules. Easily seen under the
microscope. The green lines indicate the periphery of the lobules.(50x)
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