Illustration of Ischemic Stroke (image) NIH/National Institute of Neurological Disorders and Stroke Share Print E-Mail Caption Ischemic stroke occurs when a brain blood vessel gets blocked. The gray area represents brain tissue that is not receiving nutrients as a result of the stroke. Credit Courtesy of the NINDS. Usage Restrictions For educational use only Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.