Surrounding the mucosal layer is the submucosal layer, made of loose areolar connective tissue, which helps provide the elasticity that the tube needs when you eat a whole pizza in one sitting, and it contains more blood vessels.

粘膜层周围是粘膜下层，由松散的乳晕结缔组织组成，这有助于提供管子所需的弹性（比如说当你一次吃一整块比萨饼时），它包含更多的血管。