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Boyer diss 2009 1046..

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Figure 2.4. UALVP 46685 Pronothodectes gaoi: A, stereophotographic ventral view of<br />

left promontorium. B, ventral view of left promontorium. C, HRxCT rendering of ventral<br />

view of left promontorium. Anterior to top in all parts. Fine dashed lines – sutures, thick<br />

dashed line – g3 groove, fine and heavy solid lines – boundaries between different pieces<br />

of fossil. Nerves reconstructed in yellow represent components of tympanic plexus.<br />

Neurovasculature reconstructed in red represents components of internal carotid plexus.<br />

D, HRxCT rendering of ventrolateral close-up of left promontorium. 2 mm scale applies<br />

to B-D. Numbers and abbreviations: 20 – medial and rostral tympanic processes of<br />

petrosal, 21 – tympanic and mastoid canaliculus foramen, 22 – tympanic and mastoid<br />

canaliculus groove, 23 – primary facial foramen, facial canal and/or stylomastoid<br />

foramen, 24 – remnants of bulla. av – aperture for fenestra vestibuli; cc - cochlear<br />

canaliculus; ccA – broken open aperture of cochlear canaliculus; ps – posterior septum<br />

(and internal carotid canal); g3 - groove that leads to s2 (for a small vein); g4 - groove for<br />

tympanic plexus fibers to reach routes g1-3; icp – internal carotid plexus; pcf – posterior<br />

carotid foramen; Ptr – petrosal; s1 – first (anterior) septum; s2 – second septum; s3 - third<br />

septum.<br />

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