The food mass descends into the oropharyngeal canal, where it is prevented from entering the larynx by the pharyngeal muscles, which cause the epiglottis to cover the larynx. A: 食物团进入口咽管内，并且阻止喉内的咽喉肌肉通过食物。 B: 食物团进入口咽管内，咽部肌肉会盖住喉部以阻止食物团进入喉内。