. Journal of comparative neurology. of tlu accessory ncivc of the dofi. showing bundles of darklystained uiiiiivelinated Pyridine-silver. Ocu. 0. Ohj. 8. unmyelinated fibers. Sympathetic fibers could be followed intothe trunk of the IXth nerve between its two gangha. In thetrunk of the nerve the small myeUnarted fibers outnumberedthe large fibers nine to one. In osmic acid preparations thelarge fibers measured 9 to 12 micra in diameter, the small 3 to 550 SUMNER L. KOCH 5 micra. Sections of a pyridiiie-silvcr preparation of the IXthnerve of the cat, just proximal to the superior gangh
. Journal of comparative neurology. of tlu accessory ncivc of the dofi. showing bundles of darklystained uiiiiivelinated Pyridine-silver. Ocu. 0. Ohj. 8. unmyelinated fibers. Sympathetic fibers could be followed intothe trunk of the IXth nerve between its two gangha. In thetrunk of the nerve the small myeUnarted fibers outnumberedthe large fibers nine to one. In osmic acid preparations thelarge fibers measured 9 to 12 micra in diameter, the small 3 to 550 SUMNER L. KOCH 5 micra. Sections of a pyridiiie-silvcr preparation of the IXthnerve of the cat, just proximal to the superior ganghon, showedfew large myelinated fibers 12 to 15 micra in diameter, manysmall myelinated fibers, 3 to 6 micra, and a few unmyelinatedfibers. Sections of the IXth nerve of the rabbit showed asimilar picture. No connections with the sympathetic systemdistal to the petrous ganglion were seen in any preparations. The bulbar rootlets of the accessory nerve are composed chieflyof small myelinated fibers 2 to 5 micra in diameter. The spinal. Fig. 5 From a section of the hypoglossal nerve of the dog, showing bundlesof darkly stained unmyelinated fibers joining the nerve. Pyridine-silver. , Obj. 8. portion was composed of large and small myelinated fibers inabout the ratio of five to one. The majority of the large fiberswere 9 to 12 micra in diameter, with a few larger fibers of 14 to16 micra; the small fibers 2 to 5 micra. In several preparationsat the point of its separation from the vagus, a few unmyelinatedfibers could be seen in the ramus externus, arranged in three orfour groups. Bundles of sympathetic fibers could be traced forsome distance in the sheath of the Xlth nerve, finally enteringit (fig. 3) and forming well marked clusters of fibers within its STRUCTURE OF THE CRANIAL NERVES 551 substance (fig. 4). In Pal-Weigert preparations the bluish-blackmyelin rings were separated in places by small unstained areas,corresponding closely with the location of the unmjelinatedfiber
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Keywords: ., bookauthorw, bookcentury1900, bookdecade1910, booksubjectmedicine
