The second edition of Atlas of the Developing Mouse Brain at E17.5, P0, and P6 builds on the features of the successful first edition. The second edition is a comprehensive and convenient reference for all the areas of the mouse brain at Fetal-Day 17.5 (E17.5), Day-of-Birth (P0), and Day-Six postnatal (P6). It also delineates the parts of the eye, features of the skull, ganglia, nerves, arteries, veins, bones and foramina. This atlas is an essential tool for researchers and students who study the development of the mouse brain, or who interpret the findings from genetic manipulation.