Which of the following cranial nerves is not involved in eye movement?

The trigeminal nerve (CN V) is primarily responsible for sensation in the face and certain motor functions such as biting and chewing. It does not play a direct role in controlling eye movements. In contrast, the optic nerve (CN II) is involved in vision rather than eye movement but is not a motor nerve. The oculomotor nerve (CN III) and the trochlear nerve (CN IV) are specifically responsible for eye movement; CN III controls most of the eye's movements and pupil constriction, while CN IV innervates the superior oblique muscle, allowing for the movement of the eye. Thus, when identifying which cranial nerve does not participate in eye movement, the trigeminal nerve is the clear choice.