. Regional anesthesia : its technic and clinical application . Fig. 63.—Infra-orbital block; B shows direction of needle by the oral route;X is a probe passed through the infra-orbital canal into the orbital cavity, showing howeasy it is sometimes for the needle to enter that cavity if poor technic is used. used; but care should be exercised not to introduce it as far as the hub,since it occasionally breaks at that point. The infra-orbital block is indicated in operations on the upper lipand lower eyelid. When operating on the upper lip bilateral blocking isnecessary. The lower eyelid is besid
. Regional anesthesia : its technic and clinical application . Fig. 63.—Infra-orbital block; B shows direction of needle by the oral route;X is a probe passed through the infra-orbital canal into the orbital cavity, showing howeasy it is sometimes for the needle to enter that cavity if poor technic is used. used; but care should be exercised not to introduce it as far as the hub,since it occasionally breaks at that point. The infra-orbital block is indicated in operations on the upper lipand lower eyelid. When operating on the upper lip bilateral blocking isnecessary. The lower eyelid is besides supplied by the-infratrochlear 92 REGIONAL ANESTHESIA and the temporomalar nerves, so that these nerves must likewise beblocked in order to obtain a complete anesthesia of the eyelid. Toobviate the difi&culty, field-block is resorted to, as described on page145. Deep injections into the infra-orbital canal are indicated when. Fig. 64.—Infra-orbital block. Resulting zone of anesthesia after bilateral block operating on the superior bicuspids, canines and incisors, and also inthe treatment of trifacial neuralgia, in its early stage. Mandibular Block (Blocking of the Mandibular Nerve) The mandibular or inferior maxillar^^ nerve is the third branch ofthe trigeminus and is a mixed nerve. Its sensory component arisesfrom the lateral and anterior portion of the gasserian ganglion and isjoined by the motor root, with which it is intimately associated onreaching the foramen ovale. The mandibular nerve leaves the cranialcavity through the foramen ovale, and after a course of from 2 to3 mm. divides into its various branches, of which the most important BLOCKING or CRANIAL NERVES 93 in connection with nerve-block are the inferior dental and the lingual(Fig. 65). Besides a recurrent iilament bringing in its contribution to thesensor}- innervation of the dura mater, the branches of the mandibular Mandibular tu Ante no
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