Atherothrombotic occlusion of vertebrobasilar and posterior cerebral arteries
At the boundary between the pons and the medulla two vertebral arteries merge and form the main artery. The main artery is divided further into two along the posterior cerebral artery in the interpeduncular fossa. Each of these large posterior cerebral artery gives great long and short branches of the envelopes, and small deep penetrating branches that supply blood cerebellum, medulla oblongata, the pons, midbrain, hypothalamus, thalamus, hippocampus, brains medial temporal and occipital lobe.
There is a predisposition of certain areas of the vertebrates, the main cerebral arteries and back to the atherosclerotic lesion. Most often suffer from atherosclerosis, the initial segments of both vertebral and proximal portion of the basilar artery. In addition, there is a tendency to the formation of atherosclerotic plaques in the early parts of the vertebrate main and posterior cerebral arteries.
The prognostic significance is the fact that the atheromatous lesion localization is characterized by a peculiar history of the disease, causes a specific clinical syndromes and require specific therapeutic approaches.