Source:http://linkedlifedata.com/resource/umls/id/C0031346
MSH: The muscles of the PHARYNX are voluntary muscles arranged in two layers. The external circular layer consists of three constrictors (superior, middle, and inferior). The internal longitudinal layer consists of the palatopharyngeus, the salpingopharyngeus, and the stylopharyngeus. During swallowing, the outer layer constricts the pharyngeal wall and the inner layer elevates pharynx and LARYNX.,NCI: The muscles of the pharynx, the inferior, middle and superior constrictors, salpingopharyngeus, and stylopharyngeus. (MeSH)