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Relating to or located near the petrous portion of the temporal bone.

[From Latin petrōsus, rocky; see petrous.]


(Anatomy) anatomy of, relating to, or situated near the dense part of the temporal bone that surrounds the inner ear
[C18: from Latin petrōsus full of rocks, from petra a rock, from Greek]
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Petrosals of Late Cretaceous Marsupials from North America, and a Cladistic Analysis of the Petrosal in Therian Mammals.
The petrosal is exposed on the lateral surface of the posterior braincase through a fenestra between the squamosal and parietal bones.
Meng and Fox (1995) reported on the inner ear of isolated petrosals from the Late Cretaceous of Montana belonging potentially to basal metatherians.