Spatial relation and course of the canalis caroticus cerebralis and canalis caroticus palatinum in MJSN CBE-0002 (A–D) and <i>Plesiochelys etalloni</i> (E–H).

Spatial relation and course of the canalis caroticus cerebralis and canalis caroticus palatinum in MJSN CBE-0002 (A–D) and Plesiochelys etalloni (E-H). Schematic 3D model of the basisphenoid with the two branches of the carotid canal, in ventral view (the model is semitransparent and schematic—the more complete half was mirrored) for P.bigleri (A) and P.etalloni (F). Dashed line marks the position of the crosssection image. CT-cross section image (transversal plane) of the split between the cerebral and palatal branches in P. bigleri (B) and P. etalloni (E). Ventral view on the posterior foramina of the cerebral and palatine canal in P. bigleri (C) and P. etalloni (G). Schematic 3D model of the two branches of the carotid canal, in posterior view (the model is schematic—the more complete half was mirrored) for P.bigleri (D) and P.etalloni (H). Abbreviations: bs, basisphenoid; ccc, canalis carotici cerebralis; ccp, canalis carotici palatinum; cna, canalis nervi abducentis; fpccc, foramen posterior canalis carotici cerebralis; fpccp, foramen posterior canalis carotici palatinum.