A Fine Balance (IMAGE) Salk Institute Caption V3 neurons (shown in green) relay signals from the nerve cells in the spinal cord to motor neurons (shown in blue), which cause muscles to contract (points of contact shown in yellow). In addition to establishing a balance between both sides of the body, V3 neurons ensure that the stepping rhythm is robust and well-organized. Credit Courtesy of Dr.Ying Zhang, Salk Institute for Biological Studies Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. 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.