Fruit Fly Compass Animation (video) Howard Hughes Medical Institute Share Print E-Mail Loading video... Caption Compass nerve cells in the spherical ellipsoid body (purple) get information about turns from a different groups of nerve cells in a handlebar-shaped structure perched above the compass. Some of those cells, called P-EN neurons, detect left turns (orange), while others detect right turns (blue). After a turn, P-EN neurons help shift the needle formed by active compass neurons (red) to the left or right. Credit Courtesy of Emily Nielson Usage Restrictions Must use credit 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.