A manual of operative surgery . FIG. 226.—NERVES OF THE FACE AND THEIR RELATIONS to the arteries OF the region. (From Meckel.) chap, in] TRIFACIAL NERVE, SECOND DIVISION 89 which supplies the bicuspid and canine teeth. The incisor teeth aresupplied by the anterior dental nerve, which arises at the anterior partof the canal close to the infra-orbital foramen. In order, therefore, that all the dental nerves may be severed,the nerve trunk must be divided as far back as Meckels ganglion. The posterior half of the infra-orbital canal is open to the orbit,and exists as a groove merely ; the anterior
A manual of operative surgery . FIG. 226.—NERVES OF THE FACE AND THEIR RELATIONS to the arteries OF the region. (From Meckel.) chap, in] TRIFACIAL NERVE, SECOND DIVISION 89 which supplies the bicuspid and canine teeth. The incisor teeth aresupplied by the anterior dental nerve, which arises at the anterior partof the canal close to the infra-orbital foramen. In order, therefore, that all the dental nerves may be severed,the nerve trunk must be divided as far back as Meckels ganglion. The posterior half of the infra-orbital canal is open to the orbit,and exists as a groove merely ; the anterior half has a bony roof,. FIG. 227.—NERVES OF THE FACE AND OF THE SIDE OF THE HEAD. (From Meek and takes therefore the form of a genuine osseous canal. Occasion-ally the whole or part of the posterior portion of the so-called canalhas a bony roof, and in such case no part of the nerve could be exposedfrom the orbit without cutting through a thin plate of bone. The infra-orbital vessels which accompany the nerve in the infra-orbital canal are small and have an inconstant relation to the nerve,although they more usually lie to its outer side. go OPERATIONS ON HEAD AND NECK [part hi i. The Infra-Orbital Nerve.—Surface —This nerveas it leaves the infra-orbital foramen may be exposed by meansof a transverse incision three-quarters of an inch in length madeabout a quarter of an inch below the lower margin of the orbit,and so placed as to cross the infra-orbital foramen (Figs. 226 and227). After the skin, layer of subcutaneous fat, and orbicularis musclehave been divided, the levator labii super
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