The broad band of loose connective tissue beneath the mucosa that contains blood vessels, lymph, and nerves is called the submucosa.
The four tissue layers make up the alimentary tract. These layers are the mucosa, submucosa, muscularis, and serosa, which is continuous with the mesentery, working outward from the lumen.
The submucosa, which is comprised of connective tissue and a variety of different cell types such as fibroblasts, lymphocytes, eosinophils, macrophages, plasma cells, and mast cells, is situated between the outermost layer of the mucosa and the muscularis externa. Due to its near closeness to the mucosa, the submucosa aids the absorption of electrolytes, fluids, and nutrients by the mucosa.
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