Source:http://linkedlifedata.com/resource/umls/id/C2826109
NCI: The combined organs and tissues of the respiratory tract and the upper part of the digestive tract (including the lips, mouth, tongue, nose, throat, vocal cords, and part of the esophagus and windpipe).,NCI: Anatomic structures forming the upper respiratory tract and upper part of the digestive tract. They include the oral cavity, sinonasal tract, pharynx, pyriform sinus, larynx, trachea, and esophagus.