Blood Vessels in a Square Millimeter of Brain Tissue (image) University of California - San Diego Share Print E-Mail Caption A single arteriole, highlighted in yellow, dives from the surface of the brain at the top of the image to penetrate a column of brain tissue. Blocking just one such vessel can damage the brain and lead to a focused cognitive defect, a new study has shown. Credit David Kleinfeld Lab, UC San Diego Usage Restrictions For use in illustrating reports about this specific finding. For other uses, please contact email@example.com for permission. 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.