FreeSurfer v6.0 produced reliable volume estimates for 11 hippocampal subregions.
Agreement between v5.3 and v6.0 was poor for small subregions (e.g. fimbria).
All hippocampal subregion volumes were highly heritable (h2 = 0.67–0.91).
Hippocampal subregions may be useful quantitative phenotypes for future GWA studies.