Text-book of ophthalmology . her eye. The walls of the orbit at their anterior margin become thickened intoa strong bony ring, the margin of the orbit. This constitutes the mostimportant defense of the eye against external force, especially above andbelow where it juts farthest out. On the inner side there is no sharplydefined margin to the orbit, but here the eye is protected by the bridge of 803 804 TEXT-BOOK OF OPHTHALMOLOGY the nose. On the outer side the orbital margin recedes the farthest (, A), so that here the eye is most exposed to injuries. At the uppermargin of the orbit is f
Text-book of ophthalmology . her eye. The walls of the orbit at their anterior margin become thickened intoa strong bony ring, the margin of the orbit. This constitutes the mostimportant defense of the eye against external force, especially above andbelow where it juts farthest out. On the inner side there is no sharplydefined margin to the orbit, but here the eye is protected by the bridge of 803 804 TEXT-BOOK OF OPHTHALMOLOGY the nose. On the outer side the orbital margin recedes the farthest (, A), so that here the eye is most exposed to injuries. At the uppermargin of the orbit is found the supra-orbital notch designed for the arteryand nerve of the same name (Fig. 302, i, Fig. 349, is). At the lower marginof the orbit there is a canal (the infra-orbital canal; Fig. 349, ci) for theinfra-orbital artery and nerve, and this opens upon the cheek—by meansof the infra-orbital foramen {fi, Fig. 349)—about 4 mm. beneath the orbitalmargin. This point and the supra-orbital notch are of practical Fig. 349.—Wall of the Right Boxr Orbit. (After Zuckerkandel.) The wall of the orbit is formed on the outside by the malar bone, Z, and the greater wing of thesphenoid, g; above by the frontal bone, F, and the small wing of the sphenoid, k, which encloses theforamen opticum, o, and, together with the greater wing of the sphenoid, bounds the superior orbitalfissure, a; on the inner side by the frontal process of the superior maxilla, M, the lachrymal bone, L, andthe lamina papyracea of the ethmoid bone, I; below by the superior maxilla, M, and the orbital processof the palatal bone, p. Between the greater wing of the sphenoid and the superior maxilla lies theinferior orbital fissure, », from which runs the sulcus infra-orbitalis, ci, which has its exit as the infra-orbital foramen, fi, on the anterior surface of the superior maxilla; is, supra-orbital notch; /, innerand, f\, outer orifice of the zygomaticofacial canal; z, inner orifice of the zygomatico-t
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