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Underneath The Gastric Muscularis

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Underneath the gastric mucosa lies the submucosa, muscularis, and serosa layers. The submucosa consists of connective tissues, blood vessels and nerves. The blood vessels provide nutrients to the lining of the stomach and the nerves monitor smooth muscle contraction. This smooth muscle layer is called the muscularis and is composed of 3 layers of muscle fibers which aid in the mixing and propulsion of food through the digestive tract. Surrounding the muscularis is the serosa, which is the outermost layer of the stomach. It consists of a thin membrane which secretes serous fluid to prevent friction of the outside wall of the stomach as it expands.
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