At the base of the skull the foramen ovale is a hole that transmits the mandibular nerve, the otic ganglion, the accessory meningeal artery, emissary veins (from the cavernous sinus to the pterygoid plexus) and the lesser superficial petrosal nerve. A Hippopotamuss skull A skull, or cranium, is a bony structure of vertebrates which serves as the general framework for a head. ... The mandibular nerve is the third branch (V3) of the trigeminal nerve. ... The Otic Ganglion is a parasympathetic ganglion located immediately below the foramen ovale. ... The emissary veins are valveless veins which normally drain the intracranial venous sinuses to veins on the outside of the skull. ...
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