. Regional anesthesia : its technic and clinical application . Mandibular block by the extra-oral route (1). 2. Needle No. 3 (8 cm.) is inserted immediately below the midpointof the zygomatic arch and introduced transversely through the softtissues (Fig. 67) until it reaches the pterygoid process of the sphenoidbone, at about 5 cm. from its point of entrance. The recorder withwhich the needle has previously been provided is brought in contact 96 REGIONAL ANESTHESIA.

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