. Regional anesthesia : its technic and clinical application . infra-orbital, and mental nerves at their exits from theirrespective foramina. The infra-orbital foramen gives access to the infra-orbital canal,which is directed obliquely backward and upward, making an angle ofabout 45 degrees with the floor of the orbit. The infra-orbital canalis from 1 to cm. long; it communicates with the orbital cavity,and is continued backward by the infra-orbital groove, carved in thefloor of that cavity and in which lies the maxillary nerve. It is, there-fore, clear that a needle introduced more than 1
. Regional anesthesia : its technic and clinical application . infra-orbital, and mental nerves at their exits from theirrespective foramina. The infra-orbital foramen gives access to the infra-orbital canal,which is directed obliquely backward and upward, making an angle ofabout 45 degrees with the floor of the orbit. The infra-orbital canalis from 1 to cm. long; it communicates with the orbital cavity,and is continued backward by the infra-orbital groove, carved in thefloor of that cavity and in which lies the maxillary nerve. It is, there-fore, clear that a needle introduced more than 1 cm. into the canal willreach the contents of the orbit, and, according to the depth to whichit is introduced, cause damage to some of its structures (Fig. 59). It occasionally happens that the infra-orbital canal communicateswith the antrum of Highmore and is entirely independent of the orbit. BLOCKING OF CRANLAL NERVES 87 In such cases the maxillary nerve passes through the maxilla justbeneath the roof of the antrum (Fig. 60), an anatomic disposition which. Fig. 58.—Relation of tiie supra-orbital, infra-orbital, and mental foramina toone another and to the midline as illustrated by the line A~B drawn parallel to themidline and at cm. from it. undoubtedly predisposes to neuritis, but does not interfere with thetechnic of the regional block. REGIONAL ANESTHESIA
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