This sixth of 15 short atlases reimagines the classic 5-volume Atlas of Human Central Nervous System Development. This volume presents serial sections from specimens between 40 mm and 42 mm with detailed annotations, together with 3D reconstructions. An introduction summarizes human CNS development by using high-resolution photos of methacrylate-embedded rat embryos at a similar stage of development as the human specimens in this volume. The accompanying Glossary gives definitions for all the terms used in this volume and all the others in the Atlas.