Mesodermal and Ectodermal Cell Movement (IMAGE) California Institute of Technology Caption Vectors show the mesodermal cells moving in a directed manner, traveling down and diverging at the same time. The ectoderm, on the other hand, moves down but converges as it goes. Credit Science/Angelike Stathopoulos, Caltech Usage Restrictions Credit to be given as above 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.