Figure 3. Virtual 3D reconstruction and outline drawing of petrosal UFRJ-DG 1036-M (mirrored), details of anatomy; A, posterior view; B, posteroventral view. Abbreviations: a.b.X n., notch/sulcus for the auricular branch of the vagus nerve (X); acan n, notch housing the external aperture of the cochlear canaliculus; acf, external aperture of the cochlear fossula; a.e. fv, anterior edge (salient) of fenestra vestibuli; br.thyl, broken tympanohyal; ci, crista interfenestralis; cpa, crista parotica; epr, epitympanic recess; exs, exoccipital articulation surface of petrosal; fs, facial sulcus; fv, fenestra vestibuli; hf, hiatus Fallopii; ips, sulcus of inferior petrosal sinus; lv.ips, crest-like lateroventral border of sulcus for inferior petrosal sinus; md.ips, crest-like mediodorsal border of sulcus for inferior petrosal sinus; pg, posterior occipital groove; pps, postpromontorial tympanic sinus; pr, promontorium; ptn, post-temporal notch; rsup f, foramen for the ramus superior of stapedial artery; rtp, rostral tympanic process; stf, stapedial fossa; tnn, tympanic nerve notch; tt, tegmen tympani; v.e.m., ventral extent of mastoid surface; vss, vertical sulcus for sigmoid sinus.