. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . to the brain, though ex-actly what terminal cells are concerned and how in originatingthem must be regarded as undetermined. The essential part ofthe organ of hearing is bathed by endolymph, and the princi-pal part (in mammals) is within the cochlear canal. Manspower to locate sounds is very imperfect. The auditory braincenter (or centers) has not been definitely located. Compara-tive anatomy and physiology point clearly to a progressivedevelopment of the sense of hearing. THE SENSES O
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . to the brain, though ex-actly what terminal cells are concerned and how in originatingthem must be regarded as undetermined. The essential part ofthe organ of hearing is bathed by endolymph, and the princi-pal part (in mammals) is within the cochlear canal. Manspower to locate sounds is very imperfect. The auditory braincenter (or centers) has not been definitely located. Compara-tive anatomy and physiology point clearly to a progressivedevelopment of the sense of hearing. THE SENSES OF SMELL AND TASTE. SMELL. The nose internally may be divided into a respiratory andan olfactory region. The latter, which corresponds, of course,with the distribution of the olfactory nerve, embraces the upperand part of the middle turbinated bone and the upper part ofthe septum, all of which differ in microscopic structure fromthe respiratory region. Among the ordinary cylindrical epi-thelium of the olfactory region are found peculiar hair-cellshighly suggestive of those of the labyrinth of the ear, and. Fig. 418.—Parts concerned in smell (after Hirschfeld). 1, olfactory ganglion andnerves; 2, branch of nasal nerve, distributed over the turbinated bones. which are to be regarded as the en d- organs of smell. If arom aticbodies be held before the nose, and respiration suspended, theywill not be recognized as such, and it is well known that sniff- 574 COMPARATIVE PHYSIOLOGY.
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