Figure 4

Normal radiographic anatomy of the head of the common tegu in VD projection. A. Ventral view in a superficial plane of stratigraphic dissection (only skin was removed) of the head of a tegu. B. Ventral view of stratigraphic dissection after removal of Musculus constritor colli and Musculus intermandibularis (lower part of the image) and a deeper plane of dissection (upper part of the image) of the head of a tegu (deeper plane of dissection is labelled with * on the image). C. VD radiographic projection of the head of a tegu. Ro is rostral, L is left.1. Premaxillary bone; 2. Infralabial glands; 3. Dentary bone; 4. Musculus intermandibularis; 5. Musculus adductor mandibulae externus superficialis; 6. Musculus hyoglossus; 7. Musculus pterygoideus; 8. Basihyal bone; 9. Musculus constrictor colli; 10. Tongue; 11. Oesophagus; 12. Palatine bone; 13. Pterygoid bone; 14. Entoglossal process of hyobranchial skeleton; 15. Ceratobranchial process of hyobranchial skeleton; 16. Musculus omohyoideus; 17. Musculus sternohyoideus; 18. Trachea; 19. Maxillary bone; 20. Prefrontal bone; 21. Jugal bone; 22. Squamosal bone; 23. Ectopterygoid bone; 24. Postorbital bone; 25. Frontal bone; 26. Surangular bone; 27. Adductor fossa; 28. Angular bone; 29. Articular bone; 30. Basioccipital + Supraoccipital bones; 31. Paraoccipital process of otooccipital bone; 32. Hyobranchial skeleton; 33. Quadrate bone; 34. Parietal bone; 35. Epipterygoid bone; 36. Postfrontal bone; 37. Parieto-frontal suture; 38. Interpterygoid vacuity; 39. Vomer bone.