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Petrosquamosal fissure


This short fissure forms where the inferolateral aspect of the petrous temporal bone forms a sutural junction with the inferior part of the squamous part. This suture transmits veins from the tympanic cavity to the superior petrosal venous sinus.


Petrous means like a rock. It comes from the Latin petra meaning rock. Galen was the first to use this term to describe the thick, rock-like region of the temporal bone. Squama is Latin for scale, as in the scales of a fish or reptile. It is used to denote thin flat structures in anatomy, such as bones or cells. Fissure is from the Latin fissura meaning a cleft. Fissures are gaps in bones or gaps between neighboring bones.


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