Osteology

Roentgenogram of left orbit and optic canal

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Image #37-2

Osteology

Roentgenogram of left orbit and optic canal

This is an anterior view with an upward and medial angulation in line with the axis of the optic canal. The posterior portion of the skull has been cut away to avoid conflicting shadows. The relation of the anterior clinoid process (11) to the optic canal (10) is shown.

1. Frontal sinus (ethmofrontal)
2. Ethmoidal cells (along medial wall of orbit)
3. Sphenoidal sinus (in bâckground)
4. Borders of Nasolacrimal canal (in foreground)
5. Supraorbital margin
6. Temporal line of frontal bone
7. Zygomaticofrontal suture
8. Outline of posterior opening of optic canal
9. Superior orbital fissure
10. Outline of optic foramen (anterior opening of optic canal)
11. Anterior clinoid process (lower pointer indicates tip of this process)
12. Zygomatic bone
13. Anterior limit of inferior orbital fissure
14. Infraorbital margin
15. Infraorbital foramen (maxillary sinus underlies floor of orbit in this region)