Which statement about the inferior oblique muscle of the eye is correct?

• A It arises from the common tendinous ring of Zinn
• B It passes below the superior rectus before inserting on the sclera
• C It is the only extraocular muscle supplied by the trochlear nerve
• D It abducts, elevates and laterally rotates the eyeball ✓

Explanation

The inferior oblique arises from the orbital surface of the maxilla near the lacrimal groove, not from the annulus of Zinn, making it the only extraocular muscle without that origin. It passes below the inferior rectus, inserts on the posterolateral sclera, and its actions are abduction, elevation and extorsion (lateral rotation). It is supplied by the inferior division of the oculomotor nerve; the trochlear nerve supplies only the superior oblique.

Reference: Gray's Anatomy for Students, 4th ed.

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Written and medically reviewed by the StethoPrep medical team.