What is the secondary action of the superior rectus?

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Prepare for the NBEO Ocular Motility Test. Practice with questions and explanations to enhance your understanding. Get ready for your exam easily!

Multiple Choice

What is the secondary action of the superior rectus?

Explanation:
When the superior rectus contracts, its primary action is to elevate the eye. It also produces a torsional rotation: the top of the eye twists toward the nose (intorsion, or incyclotorsion). This torsional component is the secondary action most exam questions focus on for this muscle, making intorsion the best choice. The other listed secondary effect, adduction, is also a secondary action but is not as specific to this muscle’s distinctive torsional role. Elevation is the primary action, and excyclotorsion would be twisting in the opposite direction and is not produced by this muscle.

When the superior rectus contracts, its primary action is to elevate the eye. It also produces a torsional rotation: the top of the eye twists toward the nose (intorsion, or incyclotorsion). This torsional component is the secondary action most exam questions focus on for this muscle, making intorsion the best choice. The other listed secondary effect, adduction, is also a secondary action but is not as specific to this muscle’s distinctive torsional role. Elevation is the primary action, and excyclotorsion would be twisting in the opposite direction and is not produced by this muscle.

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