Source:http://linkedlifedata.com/resource/umls/id/C0448319
MSH: A group of muscles attached to the SOFT PALATE (or velum) and the PHARYNX. They include the superior constrictor, the PALATOPHARYNGEUS, the levator veli palatini muscle, and the muscularis uvulae. This sphincter is situated between the oral and nasal cavities. A competent velopharyngeal sphincter is essential for normal speech and swallowing.