. Regional anesthesia : its technic and clinical application . rior laryngeal block; B~2-l-2-B, subcutaneous infiltration. Thehypopharjnx is anesthetized through A. (c) The superior and inferior laryngeal nerves are blocked througha single point of entrance A (Fig. 228), according to the technic de-scribed on pages 112-117. (d) The anesthesia of the h^-pophar^-nx (Fig. 229) is obtained byintroducing the needle through the thyrohyoid membrane, using the 3o8 REGIONAL ANESTHESIA same point of entrance A, and instilling drop by drop 2 of a 10 percent, cocain solution (Canuyt). (e) The anesthe
. Regional anesthesia : its technic and clinical application . rior laryngeal block; B~2-l-2-B, subcutaneous infiltration. Thehypopharjnx is anesthetized through A. (c) The superior and inferior laryngeal nerves are blocked througha single point of entrance A (Fig. 228), according to the technic de-scribed on pages 112-117. (d) The anesthesia of the h^-pophar^-nx (Fig. 229) is obtained byintroducing the needle through the thyrohyoid membrane, using the 3o8 REGIONAL ANESTHESIA same point of entrance A, and instilling drop by drop 2 of a 10 percent, cocain solution (Canuyt). (e) The anesthesia of the trachea is performed by swabbing themucous membrane with a 10 per cent, cocain solution applied throughthe tracheal opening. (f) After preliminary rhinoscopic examination as to the perme-ability of the nasal cavities, one of them is anesthetized by means ofan appUcator moistened with a 10 per cent, cocain solution, passedbeneath the inferior turbinate and advanced as far as possible esophageal sound can thus be placed with great 111! IJI Fig. 229.—.Anesthesia of the hypopharynx through the thyrohyoid membrane. (AfterGeorges Canuyt). If the cervical plexus is not blocked, the anesthesia of the larynx isobtained in the manner illustrated in Fig. 230. The position of thepatient is the same as before. Through the wheals 4 and 4 the needleis advanced toward the great comua of the hyoid bone; through 2, 3,2, and 3 the needle is passed behind the larynx, and all the soft tissueslateral to the organ infiltrated with from 50 to 60 of the percent, novocain-adrenalin solution. Circumferential injections are thenmade subcutaneously, joining all the wheals together, and the superiorlaryngeal block (page 112) performed through A, which also serves OPERATIONS ON THE NECK 309 for the anesthesia of the hypopharynx by instillations of a 10 per cent,cocain solution, made in the manner already described (page 307).The injections carried deep behind the lar
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