. Local and regional anesthesia; with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. Fig. 119.—A photograph of a tracing from Braunes well-known plate of a frozenmesial section of the female cadaver lying level. Details omitted for the sake of clear-ness. Over the spinal canal, and following its curves accurately, is a glass tube filledwith saline solution of the same specific gravity as that of the cerebrospinal fluid = Through the mid
. Local and regional anesthesia; with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. Fig. 119.—A photograph of a tracing from Braunes well-known plate of a frozenmesial section of the female cadaver lying level. Details omitted for the sake of clear-ness. Over the spinal canal, and following its curves accurately, is a glass tube filledwith saline solution of the same specific gravity as that of the cerebrospinal fluid = Through the middle vertical arm over the second lumbar interspace the hollowneedle has been introduced into the curved tube, and i of Chaputs solution (specificgravity ) colored with methyl-violet has been slowly injected. This has rundown rapidly into the dorsal curve, and at the end of two minutes is seen as a dark stra-tum opposite the fifth and sixth dorsal vertebrae. The dark area in the cervical portionof the tube is a shadow on the glass. (Barker, in Brit. Med. Jour.). Fig. 120.—Same as Fig. 119, but with the pelvis raised 3 inches from the level. Inthis case i of Biers solution has been similarly injected colored. This, having aspecific gravity of only , has not altered its position, except that, being lighterthan cerebrospinal fluid (), it has risen in the vertical arm. In this position itremains for a long time undiffused. (Barker, in Brit. Med. Jour.) ferent solutions in vitro has been studied. Of course, it is concededthat certain vital phenomena would modify the conditions some-what, but, in the main, what occurs here furnishes us with fairly 444 LOCAL ANESTHESIA correct evidence on most of the scientific physical points connectedwith these injections in the living patient (Figs. 119-125). Each of the compounds to be colored with the same quantityof methyl-violet, and used at the ordinary temperature of the airand fluid filling the tube. It has bee
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