Disorders of Extraocular Movement EOM

• Eye movement is controlled by six extraocular muscles. Assessment of EOM provides information regarding the function of the muscles themselves as well as the integrity of the cranial nerves (CN) that provide innervation.

• Medial rectus (CN III): Adducts the eye (medial gaze).

• Lateral rectus (CN VI): Abducts the eye (lateral gaze).

• Superior rectus (CN III): Elevates the eye with maximum action in lateral gaze.

• Inferior rectus (CN III): Depresses the eye with maximum action in lateral gaze.

• Superior oblique (CN IV): Depresses the eye with maximum action in medial gaze; also abducts and medially rotates (eye down and out).

• Inferior oblique (CN III): Elevates the eye with maximum action in medial gaze; also abducts and laterally rotates (eye up and out).

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