Axons -- Normal and Abnormal (image) NIH/National Institute of Mental Health Caption Cross-sections of the part of the rat brain that connects the left and right hemisphere (corpus collosum) show stunted development of neuronal wiring, called axons, in an animal that received an antidepressant (right) during a critical period around the time of birth. A protective sheath, called myelin (visible in normal animal at left), that normally wraps the axons and boosts their efficiency, failed to develop normally in the treated animal. The resultant inefficient neuronal communications could underlie the pattern of deficits seen in autism. Credit Rick C.S. Lin, Ph.D., University of Mississippi Medical Center Usage Restrictions None 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.