. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. SENSE OF HEAEING. 889 and the tendency would be to drag the stapes from the oval window. This is, however, prevented by the loose articulation of the malleus and incus, which separate to a certain extent and thus prevent drao-omo- on the stapes (Fig. 409). Hence, the system of ear-ossicles forms an angular lever, which moves around a common axis in a plane vertical to°the plane of the membrana tympani, one arm of the lever on which the power of the vibrations act being the hammer-handle, the other, the ham
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. SENSE OF HEAEING. 889 and the tendency would be to drag the stapes from the oval window. This is, however, prevented by the loose articulation of the malleus and incus, which separate to a certain extent and thus prevent drao-omo- on the stapes (Fig. 409). Hence, the system of ear-ossicles forms an angular lever, which moves around a common axis in a plane vertical to°the plane of the membrana tympani, one arm of the lever on which the power of the vibrations act being the hammer-handle, the other, the hammer-head with. / Fig. 409.—Movements op the Malleus and Incus. (Beaunis.) M, malleus; E, incus; A, short process of the incus; R, long process of the incus; P, handle of the malleus; A B, axis of movement of the ossicles. the handle, serving to set the entire fluid of the lab3rrinth into vibration. The vibrations of the ear-ossicles are, therefore, transverse, although not analogous to the transverse vibrations occurring in a stretched cord, since the ear-ossicles do not vibrate on account of their elasticity, but resemble a system of movable levers. As the long process of the incus is only one-third the length of the handle of the malleus, of course the excursions of the former, and with it the stapes, will be less than that of the tip of the malleus, while, on the other hand, the force of the vibration in the former will be increased; so that the stapes is forced inward by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Robert Meade, 1854-. Chicago, A. Eger
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