Retinal Cell Layers (IMAGE) Duke University Caption Retinas are built of a stack of neurons that transmit signals from the photoreceptors to the brain. These neurons and the synapses between them are supported by long, tree-shaped cells called Müller glia (in green), which may provide a new therapeutic target for treating degenerative eye diseases. Credit Sehwon Koh, Duke University Usage Restrictions with 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.