. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 882 PHYSIOLOGY OF THE DOMESTIC ANIMALS. scala vestibuli, while the other, or inferior, terminates in the round window and is called the scala tympani. On these laminae spirales are distributed portions of the auditory nerve, which takes origin from the floor of the fourth ventricle and runs into the petrous portion of the temporal bone through the meatus auditorius internus and divides into two divisions, one going to the cochlea and the other to the vestibule near to the end of the semicircular canals. It
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 882 PHYSIOLOGY OF THE DOMESTIC ANIMALS. scala vestibuli, while the other, or inferior, terminates in the round window and is called the scala tympani. On these laminae spirales are distributed portions of the auditory nerve, which takes origin from the floor of the fourth ventricle and runs into the petrous portion of the temporal bone through the meatus auditorius internus and divides into two divisions, one going to the cochlea and the other to the vestibule near to the end of the semicircular canals. It loses itself upon the walls of the vestibule and the walls of the ampullae, or membranous dilatations at the commencement of the three semicircular canals (Fig. 406). The cochlear nerve is distributed to the scalae of the cochlea, where its terminal fibres form connection with Corti's organ, which is placed. Fig. 406.—Scheme of the Labyrinth and Termination op the Auditory Nerve. {Landois.) I. Transverse section of a tnrn of the cochlea. II. A. ampulla of a semicircular canal: a d auditorv cells, p. provided with a fine hair; T. otoliths. III. Scheme of the human labyrinth IV Scheme of a bird's labyrinth. V. Scheme of a fish's labyrinth. in the ductus cochlearis, a small, triangular chamber; cut off from the scala vestibuli by the membrane of Reissner (Fig. 407). Corti's organ is placed on the membranous portion of the lamina spiralis, and consists of an apparatus composed of the so-called Corti's arches, each of which consists of two Corti's rods. Every two rods unite to form an arch, so that there are always two or three inner rods and two outer rods. Toward the apex of the cochlea the rods become longer and the span of the arches increases. The terminal organs of the cochlear nerve are the cylindrical hair-cells described by Corti, of which there are two rows, the row of inner cells resting on a layer of small, granular cells, and the outer cells distributed in three or f
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