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1. Skull radiograph, PA projection

In this projection the X-ray beam is parallel to an imaginary line drawn from the lateral canthus of the eye to the external auditory meatus, called the cantho-meatal line. This results in the petrous portions of the temporal bones projecting over the inferior parts of the orbits.

The innominate line represents the tangentially viewed greater wing of the sphenoid.

The superior orbital fissure transmits cranial nerves III, IV, ophthalmic division of V, VI, sympathetic nerves, the orbital branch of the middle meningeal artery, and ophthalmic veins.

The foramen rotundum transmits the maxillary division of cranial nerve V to the pterygopalatine fossa.