NEET PG DENTAL EXAM

Detailed explanation-1: -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-2: -The course of the trochlear nerve is long, with an intracranial course of 60 mm. It also has the smallest cross-sectional diameter, averaging between 0.75 and 1 mm. The trochlear nerve courses on the lateral side of the midbrain running anteriorly to enter the cavernous sinus.

Detailed explanation-3: -The cranial nerves are a set of 12 paired nerves in the back of your brain. Cranial nerves send electrical signals between your brain, face, neck and torso. Your cranial nerves help you taste, smell, hear and feel sensations.

Detailed explanation-4: -Of all the cranial nerves, the abducens nerve has the second longest intracranial course. It is located in the pons at the floor of the fourth ventricle, at the same level as the facial colliculus. In fact, the axons of the facial nerve loop around the posterior aspect of the abducens nucleus.