File:A text-book of comparative physiology (microform) - for students and practitioners of comparative (veterinary) medicine (1890) (20635452225).jpg

Title: A text-book of comparative physiology (microform) : for students and practitioners of comparative (veterinary) medicine
Identifier: cihm_40542 (find matches)
Year: 1890 (1890s)
Authors: Mills, Wesley, 1847-1915
Subjects: Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire
Publisher: New York : D. Appleton; London : Caxton House
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Digitizing Sponsor: University of Alberta Libraries

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they vibrate in masse; though aent of the hau- ls in amplitude,
Text Appearing After Image:
«n). 3, â uuiwj ji»u»y s; O, muioid celli; B, (dar ouwia; M, cochlea; trill show that the le and bony leyen, ismiihefrogt«to')t I membrane of the. und so to the fluids tposed that, for the in of the apparatua HEARING. 561 to its work, some regulative apparatxis, in the form of a nerv- ous and muscular mechanism, would have been evolved in the >rr wMmIs, tympunm; Z'meinbnui* t)nniMaii:'B,'Bi»tacUati «»^; «â¢Â»Â«Â»**;'" cells: 10, foimmen totandnm: 11, foramen oraie; 18, veatlbale; IS, cochlea; H, ecala tympant; 15, icala Teetibnll; ID, aemicirenlar canala. N B.âThe ewia ao complicated an organ that it la almoat impoasible to gire a dia- gimmmatlc represenution of It at once simple and onmpls*'",*,^ ?£)?⢠X comparison of the whole series of cnU is therefore deairaUe. tt is essential to ondeistand how the end-oigan within the seala media la stimnlated. higher groups of animals. Such is found in the tensor tym- pani, laxator tympani, and stapedius muscles, as well as the Eustachian tube. MmdM of the Middle Bur.âThe tensor tympani regulates the degree of tension of the drum-head, and hence its ampli- tude of vibration, having a damping effect, and thus preventing the ill results of very loud sounds. Ordinarily, this is, doubtless, a reflex act, in which the fifth is usually the afferent nerve concerned. It is well-known that, when we are aware that an explosion is about to take place, we ai« not as much affected by it, which would seem to argue a voluntary power of accommodation ; but of this we must speak with caution. According to some authorities the tooMxeor tympani is not a M

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