Stroke, as it has recently been redefined, is any objective evidence of permanent brain, spinal, or retinal cell death due to a vascular cause. In general, strokes are a result of either reduced blood flow caused by a thrombus or embolus or from bleeding into the brain due to vessel rupture or leak. According to the Heart Disease and Stroke Statistics it is the second leading cause of death globally. Dr. D. Winter, and Bobby Stutz of AtCor Medical, Inc. helps us to understand stroke from the perspective of the large arteries.
 
https://www.jforcs.com/7/wp-content/uploads/2015/05/05.-Understanding-Stroke-from….pdf