Which cranial nerve is tested when assessing the eye movements of a child?

When assessing the eye movements of a child, cranial nerves III, IV, and VI are specifically involved.

Cranial nerve III, known as the oculomotor nerve, is responsible for the majority of eye movements, including upward, downward, and medial motions. It also controls the constriction of the pupil and the elevation of the upper eyelid.

Cranial nerve IV, the trochlear nerve, innervates the superior oblique muscle, which allows for the downward and lateral movement of the eye.

Cranial nerve VI, the abducens nerve, controls the lateral rectus muscle that abducts the eye, enabling lateral gaze.

Together, these three cranial nerves coordinate to enable smooth and accurate eye movements, which are critical for proper visual function and tracking.

The other choices include groups of nerves that do not primarily control eye movements. Cranial nerves I (olfactory) and II (optic) are related to smell and vision, respectively, but they do not directly control eye movement. Cranial nerves V (trigeminal) and VII (facial) are involved in sensory and motor functions of the face but do not play a primary role in eye movements. Cranial nerve VIII