. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE EAR. 395. Part (if the outer wall of the perilymphatic space after Retzius. Vériok's Syst., Obj. Ill, Oc. 3. per. Periosteum. pg. Perilymphatic network. zi'i. Leucocytes. and rapidly to form a short, flattened, blind sac (saccN-^ fenestrae ovalis), which is lodg-ed in the fossa {sfo). Its walls are thin and pig-mented. (2) The ductus perilym- phaticus (Hasse), (Fig-. 245 tl]}) passes above and behind the ductus fenestrae oval'is, be- hind the auditory nerve, and near the cochlea, then behind and above the lagena to
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE EAR. 395. Part (if the outer wall of the perilymphatic space after Retzius. Vériok's Syst., Obj. Ill, Oc. 3. per. Periosteum. pg. Perilymphatic network. zi'i. Leucocytes. and rapidly to form a short, flattened, blind sac (saccN-^ fenestrae ovalis), which is lodg-ed in the fossa {sfo). Its walls are thin and pig-mented. (2) The ductus perilym- phaticus (Hasse), (Fig-. 245 tl]}) passes above and behind the ductus fenestrae oval'is, be- hind the auditory nerve, and near the cochlea, then behind and above the lagena to the aqnaeductiis cochleae (Fig. 244 ac'), where it forms a short, wide tube, which passes back- wards and inwards through this canal to the canalis jiigu- laris ; here it lies close to the nerves and forms a short oval sac {saccus per'ilymjjhatlcns) {dp), which communicates with the sub- arachnoid space of the cranial cavity by means of a tube from the neck of the sac. The walls of this structure are thin and formed of connective-tissue with very few pigment-cells. The other extremity of the tube passes to \\\q parshasïlans2ivA under the shins post, utri., between it and the pars neglecta ; it then courses to the outer side of the hinder end of the external semicircular canal : the tube then bends downwards to the outer side of the utricle and saccule to open into the general perilymphatic space. d. The membranous labyrinth (Figs. 247, 248) has the fol- lowing* parts : the utricle and sinus Siiperior, the recessus utrlculi, the anterior semicircular canal and anterior ampulla, the external semicircular canal and external ampulla, the posterior semicircnlar canal and the posterior ampulla, the saccule, ductus endolympiliaticus, and saccus endolymphaticiis, the pars neglecta, the lagena cocJdeae, the p)ars hasilaris cochleae, and the so-called tegmentnm vasculosum. In addition the following nerve-terminations can be distinguished : (i) The macula ac. recessus utrieuli, (3) the
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