coronal suture coronal suture the coronal suture is a dense, fibrous connective tissue joint that separates the two parietal bones from the frontal bone of the skull. coronal sutureside view of the skull. ("coronal suture" in red.)superior view of the skull. ("coronal suture" in red.)detailspart ofskullsystemskeletalnervetrigeminal nerveidentifierslatinsutura coronalista98a03.1.02.002ta21575fma52928anatomical terminology structure the coronal suture lies between the paired parietal bones and the frontal bone of the skull. it runs from the pterion on each side. nerve supply the coronal suture is likely supplied by a branch of the trigeminal nerve. development the coronal suture is derived from the paraxial mesoderm. clinical significance if certain bones of the skull grow too fast then premature fusion of the sutures may occur. this can result in skull deformities. there are two possible deformities that can be caused by the premature closure of the coronal suture: a high, tower-like skull called "oxycephaly" or "turret skull". a twisted and asymmetrical skull called "plagiocephaly".