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Partial obstruction is when gas or liquid stool can pass through the point of narrowing, while complete obstruction is when nothing can pass.
Now if we zoom into a cross-section of the intestinal wall, it’s lined by four layers of tissue: First, there’s the adventitia, or serosa; which is the outermost layer that faces the abdominal or peritoneal cavity. This is the space between the abdominal wall and the abdominal organs, and it’s lined by peritoneal membranes that contains a thin film of serous fluid.
Deep beneath this layer is the submucosa, which has connective tissue as well as glands, blood and lymph vessels that supply the intestinal wall.
And finally, the innermost layer is the mucosa and it’s composed of a few of its own layers: the muscularis mucosae, which has smooth muscle, the lamina propria, which is rich with blood and lymph vessels, and the innermost layer which is the epithelial lining that faces the lumen.
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