Ependymal Cells (image) Duke University Share Print E-Mail Caption Brain cells shaped like sea anemones rapidly beat their arms to keep cerebrospinal fluid circulating.Courtesy of Chay Kuo, Duke University. Credit Courtesy of Chay Kuo, Duke University. Usage Restrictions with 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.