what facial nerves are involved in speech
Definition. Glossopharyngeal/Vagus: These nerves control swallowing, gag reflex and speech and so are tested the same way. (The vagus nerve also controls internal organs such as the heart and digestive tract.) Have the test subject swallow and say ah.. The tester can touch the back of the person's throat with a tongue depressor to check the gag reflex. Term.