here are partial clinical manifestations of the right oculomotor nerve palsy:  the right pupil is 6 mm and nonreactive to light, and adduction of the right eye is impaired. The oculomotor nerve exits midbrain through the interpeduncular fossa and goes between the beginning of the posterior cerebral and superior cerebellar arteries. Rapture of an aneurysm in the posterior communicating artery near the beginning of the posterior cerebral artery may compress the oculomotor nerve and affect its function