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Pupillary fibers within the oculomotor nerve

This diagram demonstrates the superficial location of pupillary fibers within the third nerve as it courses lateral to the posterior communicating artery. III third nerve, MCA: middle cerebral artery, ICA: internal carotid artery, PCA: posterior cerebral artery, PCOM: posterior communicating artery, A: aneurysm of the PCOM. (Contributed by Dr. Marc J Dinkin.)

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  • Aneurysm
  • Diabetes mellitus
  • Hypertension
  • Intracranial tumor
  • Temporal arteritis