The oropharynx, or pharynx, is a passage that connects the back of the mouth and the nose to the esophagus. This muscular tube, which is lined with mucous membranes, is a part of the respiratory and the digestive systems. The top section of the pharynx is an air passage that connects the nasal cavity to the region behind the soft palate of the mouth. The middle section is a passage for both air and Continue Scrolling To Read More Below...