The American encyclopedia and dictionary of ophthalmology Edited by Casey A Wood, assisted by a large staff of collaborators . Points of Introduction of the Needle Over the Infratroehlear, Lachrymal andInfraorbital ]Verves. (Chevrier and Cantonnet.) of a nerve trunk, which they think has a decided advantage overinjections directly or about the- site of an operation, 1st, because lessanesthetic is required, and 2nd, because there is less deformity ofthe part produced by the injection. Oberst (Keens System of Surgery, Vol. V, 1910) deserves creditfor having introduced paraneural infiltration in
The American encyclopedia and dictionary of ophthalmology Edited by Casey A Wood, assisted by a large staff of collaborators . Points of Introduction of the Needle Over the Infratroehlear, Lachrymal andInfraorbital ]Verves. (Chevrier and Cantonnet.) of a nerve trunk, which they think has a decided advantage overinjections directly or about the- site of an operation, 1st, because lessanesthetic is required, and 2nd, because there is less deformity ofthe part produced by the injection. Oberst (Keens System of Surgery, Vol. V, 1910) deserves creditfor having introduced paraneural infiltration in 1885; while Corning,later, modified the method by injecting the nerve trunk itself with1/2 to 1 per cent, coeain solution. Any of the anesthetics may beused (coeain, in 1/2 per cent., stovain 1 per cent., alypin 1 per cent.), ANESTHESIA IN OPHTHALMIC SURGERY 441 but Chevrier and Cantonnet prefer 1 per cent, novocain solution, towhich is added a little adrenalin (how much not stated). Fifteen-minutes is required to penetrate thoroughly the nerve trunk withthe anesthetic solution. They point out that the upper lid derives. Areas of Anesthesia (regional) Produced by the Introduction of AnestheticSolutions over the Trunk of the (1) Supraorbital Xerve; (2) the LachrymalNerve; (3) the Infraorbital Nerve; (4) the Infra- or Subtrochlear Nerve (Can-tonnet). most of its sensitive nerve filaments from the supraorbital—a nervethat can be easily located. Sometimes these filaments are given off,however, before the nerve emerges from the orbit. It is necessary,therefore, to approach the nerve in the orbit. The inner fourth ofthe upper lid is supplied by the supratrochlear, therefore one injec-tion made along the roof of the orbit above and just external to thepulley for the superior oblique will aifect both nerves. The externalfourth of the upper lid is supplied by branches of the lachrymal 442 ANESTHESIA IN OPHTHALMIC SURGEHY nerves. The loAver lid receives its sensitive filaments from the
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