Which law states that agonist and antagonist EOMs of the same eye are reciprocally innervated?

• A. Troxler Effect
• B. Sherrington's Law
• C. Donder's Law
• D. Hering's Law of Equal Innervation

Answer: (B)

Reciprocal innervation between agonist and antagonist extraocular muscles within the same eye coordinates eye movements. When the eye needs to move in a direction, the muscle producing that movement (the agonist) is driven to contract, while its opposing muscle (the antagonist) is inhibited so it relaxes. This reciprocal control lets the eye shift smoothly rather than lock in or overshoot. This arrangement is captured by Sherrington's law of reciprocal innervation. It contrasts with Hering's law of equal innervation, which deals with coordinated movements of both eyes by ensuring equal innervation to corresponding (yoked) muscles in each eye. Donder's law concerns the final eye position being determined by the overall innervation regardless of the movement path, and Troxler effect is a perceptual phenomenon unrelated to motor innervation.