Final answer:
Velopharyngeal Dysfunction (VPD) may be caused by a tissue deficiency. This condition refers to the inability to close off the connection between the velopharynx and the nasopharynx during speech and swallowing.
Step-by-step explanation:
Velopharyngeal Dysfunction (VPD) may be caused by a tissue deficiency. This condition refers to the inability to close off the connection between the velopharynx and the nasopharynx during speech and swallowing. It can result in the escape of air and sound through the nose, affecting speech and swallowing.
Examples of VPD include velopharyngeal insufficiency, velopharyngeal hypertrophy, velopharyngeal obstruction, and velopharyngeal spasm. Each of these conditions has different causes and symptoms, but all involve an issue with the closure of the velopharyngeal passage.