The suture that separates the frontal and parietal bones is the:

• A. Coronal
• B. Metopic
• C. Sagittal
• D. Lambdoid

Answer: (A)

Coronal suture. It runs horizontally across the top of the skull, separating the frontal bone from the paired parietal bones. Sutures are fibrous joints that allow skull growth in infancy and childhood, and the coronal suture is the major boundary between the frontal and parietal bones. In contrast, the sagittal suture lies along the midline between the two parietal bones, the lambdoid suture sits between the parietal bones and the occipital bone at the back, and the metopic suture separates the two halves of the frontal bone in infancy (often fusing early).