Final answer:
Dysphagia is a congenital structural abnormality that causes difficulty in swallowing. The Velopharyngeal phase of swallowing is involved in lip control, oral control, and preventing nasal regurgitation.
Step-by-step explanation:
The question seems to be asking about a congenital (present at birth) structural abnormality that causes difficulty in swallowing, called dysphagia. This condition can interfere with lip control, decrease oral control, and cause nasal regurgitation. Based on the given information, it seems that the question is asking about the Velopharyngeal phase of swallowing.
The Velopharyngeal phase is a part of the overall process of swallowing called deglutition. During the pharyngeal phase of deglutition, impulses are sent from the oropharynx to the deglutition center in the medulla oblongata. These impulses cause the uvula and soft palate to move upward and close off the nasopharynx, preventing food from entering the nasal cavity. The laryngeal muscles also constrict to prevent food from entering the trachea.