Definition Of petrosal

relating to the petrosal part of the temporal bone, or the nerves that pass through it.

Drilling begins directly over the bisection of the angle between the greater superficial petrosal nerve and arcuate eminence and the dura of IAC is exposed beneath the petrous ridge.

the dense part of the temporal bone at the base of the skull, surrounding the inner ear.

Even more so than in Morganucodon, the anterior lamina of the petrosal is medially convex, leaving deep fossa for the semilunar ganglion, the root node of the trigeminal nerve.

Example Of petrosal

  • A foramen may be present in the petrobasilar fissure in front of the jugular foramen through which runs the inferior petrosal sinus.

  • Drilling begins directly over the bisection of the angle between the greater superficial petrosal nerve and arcuate eminence and the dura of IAC is exposed beneath the petrous ridge.

  • Even more so than in Morganucodon, the anterior lamina of the petrosal is medially convex, leaving deep fossa for the semilunar ganglion, the root node of the trigeminal nerve.

  • If the results of the work-up to this point are equivocal or the work-up suggests ectopic ACTH production, inferior petrosal sinus sampling is indicated.

  • Impulses are conveyed via the glossopharyngeal nerve then via its tympanic branch to the tympanic plexus thence to the otic ganglion via the lesser superficial petrosal nerve.


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