FIG. 19 in Caudal Cranium Of Thylacosmilus Atrox (Mammalia, Metatheria, Sparassodonta), A South American Predaceous Sabertooth

FIG. 19. Thylacosmilus atrox, paratype, FMNH P14344. Model of the left petrosal based on 3-D reconstruction from micro-CT data, in A, tympanic, B, lateral, C, and cerebellar views. The petrosal is damaged and the osseous labyrinth is partly exposed. Abbreviations: amf, anteromedial flange; asc, anterior semicircular canal (exposed by breakage); chlc, cochlear canaliculus (= aqueductus cochlearis); co, cochlea (exposed by breakage); csc, cavum supracochleare (exposed by breakage); ctpp, caudal tympanic process of petrosal; ffc, fossula fenestrae cochleae (= round window); fsm, fossa for stapedius muscle; fv, fenestra vestibuli (= oval window); gpn, groove for greater petrosal nerve; iam, internal acoustic meatus; ips, sulcus for inferior petrosal sinus; lsc, lateral semicircular canal (exposed by breakage); pr, promontorium; psc, posterior semicircular canal (exposed by breakage); saf, subarcuate fossa; sff, secondary facial foramen; tt, tegmen tympani; ttf, tensor tympani fossa. Asterisk (*) indicates breakage.