Main trunk blockage - both thalamus and the occipital lobe are damaged. Signs will consist of the thalamic syndrome together with homonymous hemianopia. Agonizing, burning pain. Choreoathethoid movements, ataxia or tremor. All on contralateral side.
Syndromes often includes loss of emotional control, unprovoked outbursts of laughing or crying.
The Vertebral-Basilar System A. Vertebral Arteries Symptoms resulting from occlusion of a vertebral artery are indistinguishable from those caused by occlusion of a posterior inferior cerebellar artery. B. Basilar Artery Formed by the junction of the two vertebral arteries and supplies blood to the pons, midbrain and cerebellum. Terminates by forming the two posterior cerebral arteries. Also disorders of eye movements, blindness and pupillary abnormalities. Deep reflexes are increased.