About The Medical Condition Fourth Cranial Nerve Diseases
Find the definition of the medical term Fourth Cranial Nerve Diseases. Fourth Cranial Nerve Diseases defined and explained for easy understanding at the Medical Conditions from ClusterMed.info.
Fourth Cranial Nerve Diseases
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What's The Definition Of The Medical Condition Fourth Cranial Nerve Diseases?
Diseases of the fourth cranial (trochlear) nerve or its nucleus in the midbrain. The nerve crosses as it exits the midbrain dorsally and may be injured along its course through the intracranial space, cavernous sinus, superior orbital fissure, or orbit. Clinical manifestations include weakness of the superior oblique muscle which causes vertical DIPLOPIA that is maximal when the affected eye is adducted and directed inferiorly. Head tilt may be seen as a compensatory mechanism for diplopia and rotation of the visual axis. Common etiologies include CRANIOCEREBRAL TRAUMA and INFRATENTORIAL NEOPLASMS.
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