Callosal Projection Neurons (IMAGE) Harvard Medical School Caption Callosal projection neurons (green) are shown in the cerebral cortex. Credit Jessica MacDonald and Jeffrey Macklis Usage Restrictions Use only with appropriate credit. 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.