Final answer:
The coronal suture joins the frontal bone to the parietal bones along the coronal plane of the skull.
Step-by-step explanation:
The coronal suture is the joint that unites the frontal bone to the right and left parietal bones along the coronal plane. This suture runs from side to side across the skull and is located on the top of the skull. It is one of the two suture lines seen on the top of the skull, the other being the sagittal suture.
The coronal suture is important for maintaining the structural integrity of the skull and for allowing slight movement between the bones during childbirth. It is also used in forensic anthropology to estimate the age and ancestry of human remains.