Question:
Yoke muscle of the right lateral rectus is:
Yoke muscle of the right lateral rectus is:
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In right gaze, which left-eye muscle adducts alongside it?
Updated On: Jun 24, 2026
- Left medial rectus
- Left superior rectus
- Left lateral rectus
- Left inferior oblique
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The Correct Option is A
Solution and Explanation
Step 1: Yoke muscles are contralaterally paired extraocular muscles, one in each eye, that contract together to move both eyes synergistically into the same direction of gaze (Hering's law of equal innervation).
Step 2: The right lateral rectus abducts the right eye, turning it to the right. To keep the eyes conjugate in right gaze (dextroversion), the left eye must also turn right, which is the action of the left medial rectus (adduction).
Step 3: So in right gaze the right lateral rectus and left medial rectus fire together as yoke muscles. The left superior rectus, left lateral rectus and left inferior oblique do not pair with the right lateral rectus for horizontal right gaze, making options (b), (c) and (d) wrong.
Step 4: The yoke muscle of the right lateral rectus is the left medial rectus, option (a).
Step 2: The right lateral rectus abducts the right eye, turning it to the right. To keep the eyes conjugate in right gaze (dextroversion), the left eye must also turn right, which is the action of the left medial rectus (adduction).
Step 3: So in right gaze the right lateral rectus and left medial rectus fire together as yoke muscles. The left superior rectus, left lateral rectus and left inferior oblique do not pair with the right lateral rectus for horizontal right gaze, making options (b), (c) and (d) wrong.
Step 4: The yoke muscle of the right lateral rectus is the left medial rectus, option (a).
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