Physiological variations in X-ray appearance of the optic foramen.
D002675:Child, Preschool; D006801:Humans; D009900:Optic Nerve; D009915:Orbit / Q000000981:diagnostic imaging*; D011859:Radiography; D013100:Sphenoid Bone / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000196:embryology