hemiparesis, contralateral hemianaethesia: Posteroventral nucleus of thalamus; involvement of the adjacent subthalamus body or its afferent tracts. Thalamoperforate syndrome: crossed cerebellar ataxia with ipsilateral third nerve palsy (Claude's syndrome): Dentatothalamic tract and issuing third nerve. Weber's syndrome: third nerve palsy and contralateral hemiplegia: Third nerve and cerebral peduncle. Contralateral hemiplegia: Cerebral peduncle. Paralysis or paresis of vertical eye movement, skew deviation, sluggish pupillary responses to light, slight miosis and ptosis (retraction nystagmus and "tucking" of the eyelids may be associated): Supranuclear fibers to third nerve, interstitial nucleus of Cajal, nucleus of Darkschewitsch, and posterior commissure. Contralateral rhythmic, ataxic action tremor; rhythmic postural or "holding" tremor (rubral tremor): Dentatothalamic tract. Additional images See also Circle of Willis Anterior cerebral artery References External links – Posterior cerebral artery stroke Overview Angiography at State University of New York Upstate Medical University Diagram Blood supply Arteries of the head and neck