[A macroscopical study of the nervus glossopharyngeus of shark (Mustelus manazo) (author's transl)].

Branches of the Nervus glossopharyngeus of shark Mustelus manazo, one of the most typically retained branchial nerves, is studied macroscopically with a hope of comprehension of its original morphological meanings. There were found some anastomosis among the terminal branches of the Ramus pharyngeus dorsalis of this nerve and those of the Nervus facialis, which, though in the fine caliber of branches, probably could be considered as prototype of the JACOBSON's anastomosis encountered in other vertebrates. In addition to the hitherto reported different content of their nerve components Ramus pretrematicus and posttrematicus of the N. glossopharyngeus of the shark take essentially different courses from each other, especially in relation to the Arteria efferentis branchialis:the former courses always medial to this artery, while the latter is situated laterally to this artery in the branchial arch. The Ramus pretrematicus, in this regard, seemed rather to be equivalent to the Ramus comitans internus a. branchialis of the intermediate branches of the N. glossopharyngeus. Filamentous branches were observed to be emitted from the Ramus externus comitans a. branchialis and distributed to the gill lamellae.