Daniel Adler’s MICCAI 2016 paper “Probabilistic atlas of the human hippocampus combining ex vivo MRI and histology” describes substantial progress on building a comprehensive atlas of the human hippocampus that combines ultra-high resolution ex vivo MRI and serial histological imaging. Scans from 26 ex vivo hippocampal specimens are combined into a probabilistic atlas/template using a custom registration strategy that combines surface and volume registration. Stacks of serial Nissl-stained histological sections are co-registered with the MRI and mapped into the atlas space. The atlas offers arguably the most comprehensive description of the inter-subject variability in the anatomy of hippocampal subfields. PICSL researchers are working on incorporating this atlas as a prior for automatic segmentation of hippocampal subfields in in vivo MRI scans. The atlas is also being leveraged by the international effort to harmonize the protocol for in vivo labeling of hippocampal subfields.