Velopharyngeal function and dysfunction.

The concepts regarding velopharyngeal function, the production of disordered nasalization, and the management of velopharyngeal dysfunction can be summarized as follows: 1. Although the function of the velopharyngeal mechanism is critical to the control of oral-nasal balance, the configuration and function of the speech articulatory system as a whole will determine the degree of nasalized speech that is produced. 2. Velopharyngeal dysfunction can be related to one or a combination of structural and motor limitations within the velopharyngeal mechanism. 3. There are two perceptual manifestations of velopharyngeal dysfunction. One is acoustic (nasality); the other is aerodynamic (nasal emission). For any given speaker, it is possible to hear both, and it is possible to hear one and not the other. 4. Velopharyngeal dysfunction can be treated in a variety of ways. The method of treatment should be determined by the structural characteristics of the velopharyngeal mechanism and the speech-motor abilities of the patient.