1. Oculomotor, trochlear and Abducens nerves (diagram) Trochlear nerve The trochlear nerve (CN IV) is a paired cranial nerve that is responsible for innervating the superior oblique muscle.As a result, it causes the eyeball to move downward and inward

2. All the nuclei except that of the trochlear nerve (CN IV) supply nerves of the same side of the body.

3. Cranial nerve six (CN VI), also known as the Abducens nerve, is one of the nerves responsible for the extraocular motor functions of the eye, along with the oculomotor nerve (CN III) and the trochlear nerve (CN IV).