The MAP atlas is comprised of a magnetic resonance microscopy (MRM) and an anatomic delineation volume, and a set of software tools for visualization, navigation, and registration of image volumes. The MRM volume is a diffusion-weighted image (DWI) acquired over several hours in a high-field magnet. DWI volumes show a great deal of anatomical detail and good contrast between gray and white matter. Anatomic delineations serve to help orient the user with graphical representations highlighting important anatomical detail and providing a standard description and nomenclature of the region of interest. The anatomical parcellation is based on Brain Maps (Swanson, 1998) with modifications to adapt it to mouse neuroanatomy. The delineations are overlaid upon the MRM volume for visualization.