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trochlear_nerve [2023/02/11 22:53] – Imported by DokuWiki Advanced Plugin tomtrochlear_nerve [2023/04/26 17:13] (current) – [Muscles] sabs
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 The muscle also creates abduction of the eye, moving the pupil away from the nose, and intrusion, rotating the eye such that the top of the eye moves toward the nose. The muscle also creates abduction of the eye, moving the pupil away from the nose, and intrusion, rotating the eye such that the top of the eye moves toward the nose.
  
-The superior oblique muscle is the only extraocular muscle that can lower the pupil with the eye adducted. Thus, to isolate the function of the superior oblique muscle from the other additional extraocular muscles, the muscle can be tested by requesting the patient to adduct the eye and then ask to depress the eye. Failure to depress the eye during adduction indicates a problem with the superior oblique muscle or the trochlear nerve. In addition, a general rule of thumb is that “obliques go opposite”; the left superior oblique is tested by having the patient look right, while the right superior oblique is tested with the patient looking left.+The superior oblique muscle is the only extraocular muscle that can lower the pupil with the eye adducted. Thus, to isolate the function of the superior oblique muscle from the other additional extraocular muscles, the muscle can be tested by requesting the patient to adduct the eye and then asking to depress the eye. Failure to depress the eye during adduction indicates a problem with the superior oblique muscle or the trochlear nerve. In addition, a general rule of thumb is that “obliques go opposite”; the left superior oblique is tested by having the patient look right, while the right superior oblique is tested with the patient looking left.
  
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 The diplopia in trochlear nerve palsy can be vertical or diagonal and worse with a downward gaze. Compensation for nerve palsy usually includes a head tilt to the opposite side and a tucking of the chin, so the affected eye's pupil can move up and out, instead of downwards and in. The eyes will display hypertropia during clinical examination, with the affected eye being slightly elevated relative to the other normal eye. Undercover, the affected eye will show an upward drift relative to the other eye. The diplopia in trochlear nerve palsy can be vertical or diagonal and worse with a downward gaze. Compensation for nerve palsy usually includes a head tilt to the opposite side and a tucking of the chin, so the affected eye's pupil can move up and out, instead of downwards and in. The eyes will display hypertropia during clinical examination, with the affected eye being slightly elevated relative to the other normal eye. Undercover, the affected eye will show an upward drift relative to the other eye.
  
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  • Last modified: 2023/02/11 22:53
  • by tom