• Table of Contents
• Search:

Answer

Answer 24-6. The third cranial nerve is often involved early in transtentorial herniation (with pupillary constrictor fibers usually damaged first). This is usually ipsilateral to the side of expanding lesion. The corticospinal tract is often involved next with contralateral weakness. Occasionally, with large shifts of the brain stem, this may be reversed (false localizing sign: Kernohan's notch).