Which suture lies between the two parietal bones?

• A. Coronal suture
• B. Sagittal suture
• C. Squamous suture
• D. Lambdoid suture

Answer: (B)

Sutures are fibrous joints that connect skull bones and allow growth in the developing skull; their names reflect the bones they separate and their orientation. The suture that runs along the top of the skull in the midline, separating the left and right parietal bones, is the sagittal suture. This midline placement is the defining feature: it sits between the two parietal bones. In contrast, the coronal suture lies between the frontal bone and a parietal bone, the squamous suture lies between a parietal and a temporal bone, and the lambdoid suture lies between the parietal bones and the occipital bone. So the one between the two parietal bones is the sagittal suture.