MICROANATOMY

Detailed explanation-1: -Overview over the basic anatomy and functions of the vagus nerve. The vagus nerve is responsible for the regulation of internal organ functions, such as digestion, heart rate, and respiratory rate, as well as vasomotor activity, and certain reflex actions, such as coughing, sneezing, swallowing, and vomiting (17).

Detailed explanation-2: -Eye movements can increase blood flow to the vertebral artery and stimulate the vagus nerve as it passes through the upper neck. Relaxing the muscles in the eyes engages an innate reflex called the oculocardiac reflex (OCR) which initiates a parasympathetic response to slow down the heart rate and lower blood pressure.

Detailed explanation-3: -Answer and Explanation: The trigeminal nerve (V) is not involved with controlling eye movement, which is consistent with answer choice B. The trigeminal nerve is responsible for the sensation of the face but does not innervate the muscles of the eye. Three cranial nerve pairs control the movement of the eyes.