. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE EAR. 399 buted the B. saccuH [rs) from above ; a large otolith rests on the macula and occupies a large portion o£ the cavity^ more especially the lower portion. The tubular ductus endolymphaticus {dé) arises by a narrow oval opening placed in the upper and inner part of the Fig. 249. II. III. IV. «p. cip. rpb. The membranous labyrinth of Rana esculenta ; after Retzius. Part of membranous labyrinth to show relations of the ductus and saccus endolymphatioua to the cochlear part ; magnified. The recessus utriculi and the ext
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE EAR. 399 buted the B. saccuH [rs) from above ; a large otolith rests on the macula and occupies a large portion o£ the cavity^ more especially the lower portion. The tubular ductus endolymphaticus {dé) arises by a narrow oval opening placed in the upper and inner part of the Fig. 249. II. III. IV. «p. cip. rpb. The membranous labyrinth of Rana esculenta ; after Retzius. Part of membranous labyrinth to show relations of the ductus and saccus endolymphatioua to the cochlear part ; magnified. The recessus utriculi and the external ampulla ; magnified. To show tegmentum vasculosum, pars basilaris, pars neglecta, etc. To show relations of the cochlear part to the pars neglecta. Ampulla anterior. Ampulla externa. Apertura lagenae. Posterior ampulal. apn Apertura partis neglectae. au. Apertura utriculi. ca. Canalis m. anterior. ce. External semicircular canal. Posterior semicircular canal. Opening into pars basilaris. Crista acustica. Canalis utriculo-saccularis. Ductus endolymphaticus. Ductus perilymphaticus. I. Lagena coclileae. rap. Ramulus amp. posterioris. ma. Macula ac. recessus utri- rb. Ramulus basilaris. culi. rec. Recussus utriculi. mn. Macula ac. neglecta. H. Ramulus lagenae. mp. Membrana basilaris. rn. Ramulus neglectus. Pb. Pars basilaris cochleae. rp. Ramus posterior. pc'. Dark spot on either side of rs. Ram\ilus sacculi. crest of ampulla; s. Saccule. pi. Pars ac. lagenae. xp. Posterior semicircular pn. Pars neglecta canal. ppb. Papilla ac. basilaris. .?>pl. Saccus perilymphaticus. ra. Ramus anterior. .«.?. Sinus utricuU superior. ma. Ramulus amp. anterioris. h'. Tegmentum vasculosum. vac. Ramulus amp. externa. ti. Utricle. wallj runs upwards and to the angle between the utricle and the si?ms superior, continues in the same direction for a short space, and then curves inwards to pierce the apertura aquaeductus vestibuli, and so reach the cranial cavity. It then forms a large, thin-
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