. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 416.—Otoliths from various animals (after Eiidinger). 1, from goat; 2, herring;3, devil-fish; 4, mackerel; 5, flying-fish; 6, pike; 7, carp; 8, ray; 9, shark; 10, Fio. 417.—Transverse section through head of foetal sheep, in region of hind-brain, toillustrate development of ear (after BOtteher). //. B, hind-brain; N, auditorynerve; V. JB, vertical semicircular canal; (!(, canal of cochlea; Ii. V, recessusvestibuli; G, C, auditory ganglion; (/, terminal portion of audi
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 416.—Otoliths from various animals (after Eiidinger). 1, from goat; 2, herring;3, devil-fish; 4, mackerel; 5, flying-fish; 6, pike; 7, carp; 8, ray; 9, shark; 10, Fio. 417.—Transverse section through head of foetal sheep, in region of hind-brain, toillustrate development of ear (after BOtteher). //. B, hind-brain; N, auditorynerve; V. JB, vertical semicircular canal; (!(, canal of cochlea; Ii. V, recessusvestibuli; G, C, auditory ganglion; (/, terminal portion of auditory nerve. HEARING. 571 perilymph. There is a fenestra ovalis, but not a fenestra ro-tunda, though the latter is present in reptiles. In crocodilesand birds the cochlea is tubular, straight, and divided into ascala tympani and a scala vestibuli. The columella of lowerforms still persists. In birds and mammals the bone back ofthe ear is hollowed out to some extent and communicates withthe tympanum. Except among the very lowest mammals(Echidna), the ear is such as has been described in detailalready. Evolution.—The above brief description of the auditory organin different groups of the animal kingdom will suffice to showthat there has been a progressive development or incre
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
