Cortex Fly Though (VIDEO) Picower Institute at MIT This video is under embargo. Please login to access this video. Caption A fly-through of six functionally defined regions of the mouse cortex shows different structures of blood vessels and myelin fibers. These help to produce a distinct optical value for each region called effective attenuation length. Credit Sur Lab/MIT Picower Institute Usage Restrictions with credit. License Licensed content 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.