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How are cranial nerves damaged?

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Disorders that directly damage cranial nerves include injuries, tumors, inflammation, infections (such as shingles), an inadequate blood supply (as occurs in diabetes), drugs, and toxins. Some cranial nerve disorders interfere with eye movement. Eye movement is controlled by 3 pairs of muscles. read more

Cranial neuropathy is a disorder that causes nerve damage in the nerves that arise from the brain and brainstem. This disorder can affect the ability of the face and eyes to feel and move. read more

Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). 10 of 12 of the cranial nerves originate in the brainstem. read more

Motor Function Nerves. Cranial nerves associated primarily with motor function are IV, VI, XI and XII. CN IV is the trochlear nerve, which controls inward and downward eye movement. Damage can cause double vision. CN VI, or abducens nerve, controls outward eye movement. An interruption to the abducens nerve can cause double vision. read more

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