<prompt> Which cranial nerve is involved in Weber syndrome?IIIIIIVV  <response>: Ans. is b i.e., III Focal vascular syndromes of the midbrainSyndrome nameRegionVascular supplyAnatomical structuresClinical feature sWebers syndromeMidbrainBranches of PCA and top of basilar arteryOculomotor nerve fasciclesIpsilateral third-nerve palsyClaudes syndromeMidbrain tegmentum nerve palsyBranches of PCA and top of basilar arteryCerebral peduncleOculomotor nerve fasciclesContralateral hemiparesisIpsilateral third-nerve palsy Red nucleus, superior cerebellar peduncle fibersContralaterla ataxiaBenedikts syndromeMidbrain basis and tegmentumBranches of PCA and top of basilar arteryOculomotor nerve fasciclesIpsilateral third-nerve palsy Cerebral peduncleRed nucleus, substantia nigra, superior cerebellar peduncle fibersContralateral hemiparesisContralateral ataxia, tremor, and involuntary movements 