EVERYDAY SCIENCE

Detailed explanation-1: -The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.

Detailed explanation-2: -The fourth cranial nerve (trochlear nerve) has the longest intracranial course; it is the only cranial nerve that has a dorsal exit from the brainstem (figure 1). It begins in the midbrain at the level of the inferior colliculus as fascicles extending from the fourth nerve nuclei.

Detailed explanation-3: -Nerves that connect directly to the brain are known as cranial nerves, and the longest cranial nerve we have is the vagus. (The longest nerve in the body might actually be the sciatic nerve, which goes down each leg.

Detailed explanation-4: -The sciatic nerve is the longest, largest nerve in your body. Your sciatic nerve roots start in your lower back and run down the back of each leg.

Detailed explanation-5: -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).