is formed by three layers, including a layer of fibrocollagenous and elastic tissue containing blood vessels and nerves known as the submucosa, mucosal lamina propria consists of cells, blood vessels, neural elements, and fibers embedded in an amorphous(no definite form) ground substance, submucosa contains blood vessels, nerves, and lymphatics, and it is a loose connective tissue containing fat, blood vessels, nerves, and lymphatics
