The video tutorial explains the corneal reflex, involving cranial nerves 5 (trigeminal) and 7 (facial). It details the normal reflex process, where both eyes blink simultaneously when one is stimulated. The tutorial explores the effects of lesions on these nerves, showing how damage to the trigeminal nerve stops blinking in both eyes when the affected side is stimulated, while damage to the facial nerve prevents blinking in the lesioned eye regardless of which cornea is stimulated. The video emphasizes understanding the pathways over memorization.

What new insight or understanding did you gain from this video?