Fig. 5 in Petrosal and cranial vascular system of the early Eocene palaeoryctid mammal Eoryctes melanus from northwestern Wyoming, USA

Fig. 5. Palaeoryctid mammal Eoryctes melanus Thewissen and Gingerich, 1989, UM 68074 (UM locality SC-133, Clarks Fork Basin, Wyoming, USA; early Wasatchian Land-Mammal Age, early Eocene), isosurface of cranium rendered from CT scans in ventral view, with neurovascular structures reconstructed based in part on Avizo segmentation (left petrosal in gold; arteries in red; veins in blue; nerves in yellow). The alisphenoid canal is broken on the left side in UM 68074 (see Fig. 1), but is reconstructed here to show the course of the ramus infraorbitalis. Abbreviations: gpn, greater petrosal nerve; ica, internal carotid artery; icn, internal carotid nerve; ijv, internal jugular vein; npc, nerve of pterygoid canal; on + oa, optic nerve and ophthalmic artery; pgv, postglenoid vein; ri, ramus inferior; rio, ramus infraorbitalis; rm, ramus mandibularis; rso, ramus supraorbitalis; V1, ophthalmic nerve, first division of trigeminal nerve; V2, maxillary nerve, second division of trigeminal nerve; V3, mandibular nerve, third division of trigeminal nerve.