A practical treatise on the diseases of the ear including the anatomy of the organ . There are, conse-quently, five. These openings are called ampullae (flasks) from30 4G6 SEMICIRCULAR CANALS. their shape, and are more than twice the diameter of thetubes. The inner extremity of the superior vertical canalhas a common opening into the vestibule with the posteriorvertical. According to Henle,* in the later years of life the semi-circular canals increase in length; the horizontal canal in-creases the most, and the anterior vertical the least. Thecanals also increase very slightly in width ; about
A practical treatise on the diseases of the ear including the anatomy of the organ . There are, conse-quently, five. These openings are called ampullae (flasks) from30 4G6 SEMICIRCULAR CANALS. their shape, and are more than twice the diameter of thetubes. The inner extremity of the superior vertical canalhas a common opening into the vestibule with the posteriorvertical. According to Henle,* in the later years of life the semi-circular canals increase in length; the horizontal canal in-creases the most, and the anterior vertical the least. Thecanals also increase very slightly in width ; about to Hyrtl. The functions of the semicircular canals, according to theexperiments of Flourensf and Goltz,;J: are to preserve the equi-librium of the head, and consequently of the body. Goltzbelieves that the semicircular canals are not, so to speak,essential to the function of hearing. THE COCHLEA. This part of the internal ear is so named from its resem-blance to a common snail; a resemblance which is verymarked. It is one of the most remarkable instances in the. Section through the Apex of the Eight Osseous Cochlea, parallel with the Lower surf ace of the section. t>. Upper surface of the section, c, *. Canal of facial nerve. whole body of the compact packing of very important Jones § remarks of its function, that the presence ofa cochlea is evidence of a very advanced condition of the organ * Lelirbucli, p. 762. t Von Troltsch, second American edition, p. 505. % Knapp, Archives of Ophthalmology and Otology, vol. ii., No. 1. Brun-ner, ibid., 1. c. § Cyclopedia of Anatomy and Physiology, p. 569. COCHLEA. 467 of hearing ; beyond tins we can arrive at no definite conclu-sion in the present state of our knowledge. Recent investiga-tions, however, render it safe to say that one of the functionsof the cochlea is to discriminate between tones. The fibresof Corti connected to the cells that are to be described, beiDgthe keys of an instrument
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