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The next layer after the mucosa is called the submucosa. This layer is a thick layer of loose connective tissue. Although this layer does not have any sub-layers, it does have blood vessels, vessels belonging to the lymphatic system, and nerves, some of which control digestion.In some places, such as the small intestine, the submucosa also contains cells that secrete mucus onto the surface of the tract.After the submucosa is a layer called the muscularis externa. Except for the upper portion of the esophagus, this layer consists of smooth muscle.n some places, such as the small intestine, the submucosa also contains cells that secrete mucus onto the surface of the tract. After the submucosa is a layer called the muscularis externa. Except for the upper portion of the esophagus, this layer consists of smooth muscle.
The lamina propria which underlies the epithelium has a rich vascular and lymphatic network, which absorbs the digestive products, and there is a muscularis mucosae layer immediately at the base of the crypts. The lymphatic capillaries are called lacteals, and absorb lipids.The vascular capillaries are fenestrated to aid absorption. The muscularis externa layer contains two layers of smooth muscle, an inner circular and outer longitudinal, for continuous peristaltic activity of the small intestine.he lamina propria which underlies the epithelium has a rich vascular and lymphatic network, which absorbs the digestive products, and there is a muscularis mucosae layer immediately at the base of the crypts. The lymphatic capillaries are called lacteals, and absorb lipids.