References in periodicals archive ?
Velopharyngeal incompetence is inability to close the velopharyngeal sphincter completely; it can occur due to any structural defect of the velum or pharyngeal wall at the level of nasopahrynx or mechanical interference for closure.
Dysfunction of the velopharyngeal sphincter from obvious abnormalities of the pharyngeal wall are readily seen and diagnosed early.
Velopharyngeal sphincter physiology in deaf individuals.