Eye injuries and their treatment . rve, and on that ofthe external rectus is the sixth. The cavernous sinus has been opened toshow the third, fourth, fifth, and sixth nerves, and the internal carotid arteryon which lies the sympathetic plexus (not, however, seen). The lachrymalgland has been displaced, and is pinned away from its proper positionat the upper and outer angle of the orbit. The nerve and artery enteringit are well seen, as are also the recti and oblique muscles in their properplaces. The superior maxillary division of the fifth nerve, entering thrpughthe foramen rotundum, passes f
Eye injuries and their treatment . rve, and on that ofthe external rectus is the sixth. The cavernous sinus has been opened toshow the third, fourth, fifth, and sixth nerves, and the internal carotid arteryon which lies the sympathetic plexus (not, however, seen). The lachrymalgland has been displaced, and is pinned away from its proper positionat the upper and outer angle of the orbit. The nerve and artery enteringit are well seen, as are also the recti and oblique muscles in their properplaces. The superior maxillary division of the fifth nerve, entering thrpughthe foramen rotundum, passes first into the spheno-maxillary fossa, andthence by the infra-orbital canal, and through the infra-orbital foramenon to the face. The inferior maxillary division of the fifth nerve is seenpassing through the foramen ovale on the surface of the internal pterygoidmuscle (the external pterygoid having been removed), and breaking upinto two large branches—the lingual and inferior dental—and severalsmaller muscular branches. PLATE I. INTRODUCTORY 7 from the globe, and by arresting small particles of dust,which would otherwise impinge on the conjunctivalsurface, while the busy winking of the eyelids keepsthe surface of the cornea constantly clear and the slightest warning of the approach of dangerthe eyelids close instinctively, and in association withthis movement the ball rolls upwards in order that thecornea may be brought wholly under cover of the upperlid. If, however, a foreign body manages to evade allthese natural guards, and to gain entrance to the con-junctival sac, the amount of irritation which it excitesis, in itself, a source of safety. Although the facialnerve is now regarded as controlling the secretionof the lachrymal gland, the fifth cranial nerve endowsthe cornea and conjunctiva with sensibility, with theresult that when a particle of dust falls upon the eyea reflex flow of tears at once occurs, sufficient in mostinstances, provided a little patience b
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