The eMouseAtlas team have re-digitised the original histological sections used for the "Atlas of Mouse Development" by Matt Kaufman. The resource is published available on the Web at http://www.emouseatlas.org/emap/eHistology_supplement/ and the publication at https://doi.org/10.1242/dev.124917. This is the dataset for Plate s3a image a.*'citation.txt' - how to cite use of this image; *'details.txt' - the embryo text description that appears at the top of the printed atlas page; *'image.jpg' - full resolution jpeg image of the histological section; *'terms.txt' - tab-delimited table of the annotations for this image providing the annotations, location in the image, annotation number and EMAPA ID. *'url.txt' - text file providing the URL for the image on the emouseatlas.org web resource.