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LOCAL AND REGIONAL ANESTHESIA
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Fig. 157.—Position of needle in giving the infra-orbital injection, a represents the place
of puncturing the soft tissues. If it is desired to accompany this injection with the perpen-
dicular infiltration injection, the soft tissues should be punctured midway between the point
marked o and the gingival margin of the gum.
surface of the ramus will necessitate the swinging of the syringe
to the median line as the needle progresses. It is very essential
that the needle passes into the sulcus mandibularis, above the
lingual, or else it will pass over this into the pterygoid muscle, of-
