Chambers's encyclopaedia; a dictionary of universal knowledge for the people . the manner in which the nervespreads out in the spiral limina. Several theories have been held at different periods with regardto the manner in which the nerves terminate in the cochlea, andhow sound is transmitted from the latter to the brain. The latest,and that whicli is at pnesent entertained by most physiologists, isthat of M. Schultze. It has been shown by actual experiment,that when a nerve in connection with a muscle is acted upon by asuccession of very raiiid strokes from the little hammer of a tetan-niotor
Chambers's encyclopaedia; a dictionary of universal knowledge for the people . the manner in which the nervespreads out in the spiral limina. Several theories have been held at different periods with regardto the manner in which the nerves terminate in the cochlea, andhow sound is transmitted from the latter to the brain. The latest,and that whicli is at pnesent entertained by most physiologists, isthat of M. Schultze. It has been shown by actual experiment,that when a nerve in connection with a muscle is acted upon by asuccession of very raiiid strokes from the little hammer of a tetan-niotor, and when the strokes have arrived at a certain number intlie second, a stimulus is sent along the nerve exciting the muscleto action. It is the same way that M. Schultze supposes the impression of sound to be propagated to the nerves of the cochlea,by means of a series of little tetanmotors called the teeth of Corti,who discovei-ed them. They are situated in the spiral lamina, which sejiarates tlie spiralcanal in the interior of the cochlea into an upper and lower half or. Fig. 2.—Rigbt Auditory Nerve scala. The spiral lamina consists of an osseous septum, next tothe central axis of the cochlea, and of a membranous layer whichprolongs the osseous septum to the outer wall of the cochlea, tluiscompleting the spiral lamina. This membranous septum is double,and between its layers there is a chamber which contains theteeth of Corti, ranged side by side throughout the whole length ofthe spiral lamina, and gradually getting shorter from base to apex,like the strings of a harp or pianoforte. The chamber is filled up by AUDLEY—AUGIER. 401 a tremulous jelly-like fluid.
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