The gag reflex is controlled by which cranial nerves?

The gag reflex is primarily controlled by the glossopharyngeal nerve and the vagus nerve. The glossopharyngeal nerve (cranial nerve IX) is responsible for the sensory component of the gag reflex, detecting stimuli in the pharynx and triggering the reflex response. The vagus nerve (cranial nerve X) plays a crucial role in the motor response, activating the muscles responsible for the gagging action.

Understanding this reflex is important because it serves as a protective mechanism to prevent choking and aspiration by allowing the body to expel foreign objects or substances from the throat. This is why the correct option highlights the involvement of the glossopharyngeal and vagus nerves in coordinating both the sensory detection and the motor response of the gag reflex.