Bregma is the junction of which bones?

• A. Frontal bone and parietal bones
• B. Occipital and parietal bones
• C. Temporal and sphenoid
• D. Nasion and frontal

Answer: (A)

Bregma is the landmark where the sagittal and coronal sutures intersect, at the point where the frontal bone meets the parietal bones. This is the anterior meeting point of the two parietal bones with the frontal bone, and it corresponds to the anterior fontanelle in infants. The other named junctions refer to different sutures: lambda is the junction of the sagittal and lambdoid sutures between the parietal and occipital bones; nasion marks the frontonasal junction between the frontal and nasal bones; and the pterion is the thin region where multiple bones (frontal, parietal, temporal, and sphenoid) come together. So the bones involved at bregma are the frontal and parietal bones.