sphenoparietal suture sphenoparietal suture the sphenoparietal suture is the cranial suture between the sphenoid bone and the parietal bone. it is one of the sutures that comprises the pterion. sphenoparietal suturesphenoparietal suture in redposition of sphenoparietal suture parietal bone sphenoid bonedetailsidentifierslatinsutura sphenoparietalista98a03.1.02.009ta21583fma52945anatomical terminology additional images position of sphenoparietal suture (shown in red). animation. parietal bones (above) and sphenoid bone (below) side view of the skull. sphenoparietal suture indicated by the arrow. left zygomatic bone in situ. (sphenoparietal suture visible at upper right in blue.)