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Boyer diss 2009 1046..

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Figure 2.5. UALVP 46685 Pronothodectes gaoi: A, ventromedial close-up of right<br />

promontorium (1 mm scale). B, ventromedial close-up of right promontorium. B’,<br />

ventromedial close-up of medial tympanic process. B’’, ventromedial close-up of medial<br />

tympanic process, labels removed. C, HRxCT rendering of right lateral view of skull (10<br />

mm scale). C’, inset of promontorium in ventromedial view from C. D, image from C’<br />

rotated to ventral view. E, labeled image from D with obscuring morphology cropped<br />

away. F, labeled image from E rotated into lateral view, to reveal various foramina and<br />

cross-sectioned canals. Anterior to top in all parts. Nerves reconstructed in yellow<br />

represent components of tympanic plexus. Fine dashed lines – sutures, thick dashed lines<br />

– g3 groove, fine and heavy solid lines – boundaries between different pieces of fossil.<br />

Numbers and abbreviations: 20 – medial and rostral tympanic processes of petrosal, 23 –<br />

primary facial foramen, facial canal and/or stylomastoid foramen, 24 – remnants of bulla,<br />

25 – dorsal (petrosal?) layer of bone on medial process of petrosal, 26 – ventral<br />

(nonpetrosal?) layer of bone on medial process of petrosal. ac – aperture of cochlear<br />

fenestra; av – aperture of fenestra vestibuli; bs – bullar suture; cc – cochlear canaliculus;<br />

fo – foramen (likely leads to canals that transmitted neurovasculature between tympanic<br />

cavity and jugular foramen); g3 (dashed because it is not well-defined) - groove that leads<br />

to s2 (for a small vein?); g4 - groove for tympanic plexus fibers to reach routes g1-3; icp<br />

– internal carotid plexus; pcf – posterior carotid foramen; Ptr – petrosal; s1 – first<br />

(anterior) septum; s2 – second septum; s3 - third septum; scc – semicircular canal.<br />

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