Describe the four layers of the GI tract
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1. Mucosa is the moist innermost layer; it lines the cavity of the organ. The mucosa consists primarily of a surface epithelium mostly composed of simple columnar epithelium, a small amount of connective tissue (lamina propria), and a scanty smooth muscle layer.
2. The submucosa is found just beneath the mucosa layer. It contains blood vessels, nerve endings, mucosa-associated lymphatic tissue (MALT), and lymphatic vessels.
3. The muscularis externa is the next layer, which is typically made up of a circular and a longitudinal layer of smooth muscle.
4. The outermost layer is the serosa, which consists of two single layers of cells. The innermost serosa is the visceral peritoneum. The outermost layer is the parietal peritoneum which lines the abdominal cavity by way of a membrane extension called the mesentery. Between these layers is serous fluid.
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Indicate whether the statement is true or false