sphenopetrosal fissure sphenopetrosal fissure the sphenopetrosal fissure (or sphenopetrosal suture) is the cranial suture between the sphenoid bone and the petrous portion of the temporal bone. sphenopetrosal fissurebase of the skull. upper surface. (sphenopetrosal suture is the suture between the sphenoid bone, in yellow, and the temporal bone, in pink. "petrous portion of temporal" is labeled right above the crest at the bottom of the pink region.)left zygomatic bone in situ.detailsidentifierslatinfissura sphenopetrosa,sutura sphenopetrosata98a02.1.00.046ta2449fma75038anatomical terminology it is in the middle cranial fossa.