Reconstructed Neurons (IMAGE) Howard Hughes Medical Institute Caption The fruit fly brain contains roughly 100,000 neurons, which can now be traced in detail using a dataset that includes roughly 21 million images. Janelia scientists traced the paths of neurons (colored threads) that reach out to the mushroom body, a region involved in memory and learning. Credit Z. Zheng et al./<i>Cell</i> 2018 Usage Restrictions Must use 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.