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Fig. 6 | Swiss Journal of Palaeontology

Fig. 6

From: First evidence of Proganochelys quenstedtii (Testudinata) from the Plateosaurus bonebeds (Norian, Late Triassic) of Frick, Canton Aargau, Switzerland

Fig. 6

3D renderings of the sagittally and axially sectioned braincase of Proganochelys quenstedtii (SMF 09-F2). A, Dorsomedial view onto left side of sectioned braincase, exposing the medial surface of the braincase. Note that nerve endocasts and the endosseous labyrinth is also rendered. B, Same image as A, but with interpretative line drawings. Note that the arrow in B indicates the course of the CN X–XI from the foramen jugulare anterius through a short canal. Abbreviations: btb, basis tuberculi basalis; clp, clinoid process; ds, dorsum sellae; exr, exoccipital ridge; fav, foramen aquaducti vestibuli; foramen jugulare anterius (i.e., internal braincase opening for CN X–XI; fpl, fenestra perilymphatica; occ, occipital condyle; pao, pila antotica; pop, paroccipital process; stag, stapedial artery groove; V, prootic foramen for the trigeminal (CN V) nerve; VI, (internal) abducens nerve (CN VI) foramen; VII, (internal) facial nerve (CN VI) foramen; VIII, (internal) acoustic nerve foramina; X–XI, course of vagus (CN X) and accessory (CN XI) nerves; XII, hypoglossal nerve foramina

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