It is important to remember that cranial nerves never cross (except for one exception, the 4th CN) and clinical findings are always on the same side as the cranial nerve involved.

Do all cranial nerves Decussate?

The trochlear nerve (cranial nerve IV) is a motor nerve that innervates a single muscle: the superior oblique muscle of the eye. ... Other than the optic nerve (cranial nerve II), it is the only cranial nerve that decussates (crosses to the other side) before innervating its target.

Do cranial nerves innervate contralateral?

The trochlear nerve supplies motor innervation to the dorsal oblique muscle of the contralateral side from its cell bodies of origin. ... It is the only cranial nerve that emerges from the brainstem dorsally and the only cranial nerve that innervates contralateral structures.