Vertebrobasilar insufficiency is a condition characterized by poor blood flow to the posterior (back) portion of the brain, which is fed by two vertebral arteries that join to become the basilar artery. Blockage of these arteries occurs over time through a process called atherosclerosis, or the build-up of plaque.
No, Portugal is not a Mediterranean country. It does, however, have a mediterranean climate, but it is not considered a mediterranean country because the south does not have the Mediterranean Sea as a coast.
The Mediterranean Sea is connected to the Atlantic Ocean via the narrow Strait of Gibraltar between Spain and Morocco. This area is only about 14 miles (22 km) wide. The Mediterranean Sea is known for being an important historic trade and a strong factor in the development of the region around it.