We can find four principal layers composing the digestive tube walls. From the lumen to the exterior: Mucosa, Submucosa, Muscle, and Serosa Layers.
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There are four principal layers composing the digestive tube walls.
From the lumen to the exterior of the tube, we can find,
Mucosa Layer
- Composed of lining epithelium, a propria lamina of connective tissue, and a smooth muscle layer.
- The epithelium works as a barrier that separates the lumen from the organ.
- Propria lamina has glands, vessels that get the absorbed substances, and immune system elements.
- The smooth muscle delimitates the mucose from the submucosa layer. It produces movements that are independent of the rest of the organ's movements.
Submucosa Layer
- Dense connective tissue is placed under the mucosa.
- It has bigger vessels that ramification to the mucose, muscle layer, and serosa layer.
- In certain areas, this layer also has glands.
Muscle Layer
- Composed of two or three concentric smooth muscle layers that differ in their orientation.
- The contraction of these layers mixes and propels the content of the lumen of the digestive tube.
Serosa layer
- Connective tissue membrane covered by simple plane epithelium.
- High caliber vessels are placed in this layer and limphatic vessels.
- There are regions of the digestive tube where there is no serosa layer. Instead, there is a connective tissue named the adventitious layer.
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