The Trochlear & Abducent By Prof. Dr. Imran Qureshi The Trochlear Nerve (SE)

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Isolated lesions of the trochlear nerve are uncommon. Obviously, the effect will be limited to paralysis of the superior oblique. The superior oblique is chiefly active during depression of the eye when it either looks straight ahead or is adducted.

When the muscle is paralyzed on one side, such depression cannot occur, resulting in double vision when the patient attempts to look downward. The two most common daily activities that involve looking down are reading and walking down stairs.

A complaint of double vision during these activities is a sign of trochlear nerve damage.

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