NEET PG DENTAL EXAM

Detailed explanation-1: -The trochlear nerve is one of 12 sets of cranial nerves. It enables movement in the eye’s superior oblique muscle . This makes it possible to look down. The nerve also enables you to move your eyes toward your nose or away from it.

Detailed explanation-2: -The trochlear nerve (CN IV) arises from the trochlear nucleus located within the periaqueductal gray substance of the midbrain and emerges on the dorsal midbrain caudal to the inferior colliculus. It then crosses the midline, before passing anteriorly around the contralateral side of the brainstem.

Detailed explanation-3: -The oculomotor nerve is the third cranial nerve. It controls four of the six muscles that enable eye movement. Conditions affecting cranial nerve III include third nerve palsy.

Detailed explanation-4: -1.5. The fourth cranial nerve is the trochlear nerve and contains only somatic motor fibers. It supplies a single extraocular muscle – the superior oblique – a muscle responsible for intorsion of the eye with a small amount of abduction and depression. It arises from the trochlear nucleus at the level of the midbrain.