. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. SENSE ORGANS. 179 rior surface (Fig. 113). In the vestibular sac and at- tached to hairlike nerve terminals there are several little sandlike grains of carbonate of lime (otoliths). By mo- tion of the endolymph these are shaken and affect the hairlike nerve terminals, which thus become delicate perceivers of the slightest movements caused by vibra- tion. Again, in the ampullas the nerve fibers terminate in little stiffish hairs projecting from the walls toward the center like the
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. SENSE ORGANS. 179 rior surface (Fig. 113). In the vestibular sac and at- tached to hairlike nerve terminals there are several little sandlike grains of carbonate of lime (otoliths). By mo- tion of the endolymph these are shaken and affect the hairlike nerve terminals, which thus become delicate perceivers of the slightest movements caused by vibra- tion. Again, in the ampullas the nerve fibers terminate in little stiffish hairs projecting from the walls toward the center like the hairs in a mule's ears (Fig. 114). Vibratory shakings of the endolymph, passing up from the vestibular sac through the ampulla? into the semi-. tec Fig. 113.—vs, vestibule sac; sc, membranous semicircular canals; am, am- pulla ; », nerve ; s, sacculus. circular canals and back to the vestibular sac, set these hairs trembling, and hence they also become delicate perceivers of slight vibration. Membranous Cochlea.—We have compared the bony cochlea to a hollow stairway winding about a central pillar ; now the membranous cochlea may be compared to the stair in this stairway, running across. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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