Bregma Last edited and medically reviewed by Alaric Steinmetz on 21.09.2023 Bregma is a superficial anatomical landmark. DefinitionBregma is defined as the intersection of the Sutura coronalisSutura sagittalisReference valuesIn one study, the bregma–Nasion distance on CT was 126.6 mm ± 7.3 mm[^1]. Figure Enlarge Depiction of the bregma on the skull (red circle).