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orbit - abducens nerve
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To test the abducens nerve the action of the LR should be examined. The abducens nerve is the most commonly affected nerve innervating extraocular muscles, with damage arising from conditions such as cavernous sinus thrombosis, ICA aneurysm within the cavernous sinus, or a tumor at the base of the brain compressing the abducens against the clivus.

To test the abducens nerve the action of the LR should be examined. The abducens nerve is the most commonly affected nerve innervating extraocular muscles, with damage arising from conditions such as cavernous sinus thrombosis, ICA aneurysm within the cavernous sinus, or a tumor at the base of the brain compressing the abducens against the clivus.

Structures running through the cavernous sinus include the internal carotid artery, oculomotor nerve, trochlear nerve, abducens nerve, the ophthalmic division of the trigeminal nerve (V1) and sometimes the maxillary division of the trigeminal nerve (V2). A cavernous sinus thrombosis or infection therefore has the potential adversely affect all these structures. The abducens nerve is usually the first to be affected due to its free-floating location centrally within the sinus.
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