Boyer diss 2009 1046..

Boyer diss 2009 1046.. Boyer diss 2009 1046..

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Figure 2.21. MNHN CR 125 Plesiadapis tricuspidens: A, stereophotographic ventral view of right promontorium. B, ventral view of right promontorium. C, ventral view of right promontorium inset of tca groove. C’, enlargement of inset C showing groove and foramina relating to tympanic nerve (canal edges out of focus). Anterior to top. Nerves reconstructed in yellow represent components of tympanic plexus. Neurovasculature reconstructed in red represents components of the internal carotid plexus. Numbers and abbreviations: 94 – tca foramen, 95 – tca groove. Boc – basioccipital; cc – cochlear canaliculus; ps – posterior septum; Ect – ectotympanic; Eoc – exoccipital; g4 - groove for tympanic plexus fibers to reach routes g1-3; g5 – groove that leads toward epitympanic crest; pgf – postglenoid foramen; ptr – petrosal; s1 – first (anterior) septum; s2 – second septum; sab – strut from annular part to bullar part; Sq – squamosal; tc – tubal canal; tng – tympanic nerve groove. 138

Figure 2.22. MNHN CR 965, Plesiadapis tricuspidens: A, dorsal view of cranial fragment. B, ventral view. C, ventral inset and enlargement of M 2 . D, right lateral view. This specimen is revealed to be P. tricuspidens by size and morphology of M 2 as well as by details of cranial morphology. 139

Figure 2.21. MNHN CR 125 Plesiadapis tricuspidens: A, stereophotographic ventral<br />

view of right promontorium. B, ventral view of right promontorium. C, ventral view of<br />

right promontorium inset of tca groove. C’, enlargement of inset C showing groove and<br />

foramina relating to tympanic nerve (canal edges out of focus). Anterior to top. Nerves<br />

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

reconstructed in red represents components of the internal carotid plexus. Numbers and<br />

abbreviations: 94 – tca foramen, 95 – tca groove. Boc – basioccipital; cc – cochlear<br />

canaliculus; ps – posterior septum; Ect – ectotympanic; Eoc – exoccipital; g4 - groove for<br />

tympanic plexus fibers to reach routes g1-3; g5 – groove that leads toward epitympanic<br />

crest; pgf – postglenoid foramen; ptr – petrosal; s1 – first (anterior) septum; s2 – second<br />

septum; sab – strut from annular part to bullar part; Sq – squamosal; tc – tubal canal; tng<br />

– tympanic nerve groove.<br />

138

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