. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. two passages, by means of a bony and membra-nous plate. At the extremity of the modiolus, the two pas-sages communicate witli each other. At the other extremity,one openG into the vestibule ; tlie other into the tympanum, by 955. What passes through the small openings of the mfcldle ear ?956. Of what loes the labyrinth consist ? Give the parts of the internalcir. 057. De; cribe the vestibule. 958. What is said of tlie ? ,59. Why is the cochlea so called? Of what does it consist?
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. two passages, by means of a bony and membra-nous plate. At the extremity of the modiolus, the two pas-sages communicate witli each other. At the other extremity,one openG into the vestibule ; tlie other into the tympanum, by 955. What passes through the small openings of the mfcldle ear ?956. Of what loes the labyrinth consist ? Give the parts of the internalcir. 057. De; cribe the vestibule. 958. What is said of tlie ? ,59. Why is the cochlea so called? Of what does it consist?900. How is tl • interior of the canal of the cochlea divided ? Where dotliey commu/» ate with each other ? ANATOMY OF THE ORGANS OF HEARING. 419 the foramen rotimdum. The internal surface of the bonylabyrinth is lined by a hbro-serous membrane. 9G1. The membranous labyrinth is smaller in size, but aperfect counterpart, with respect to form, of the bony vestibule,cochlea, and semicircular canals. Within this labyrinth aretwo small, elongated sacs, which are filled with a fluid. Fig. 1 Fig. 147 A view of the auditory nerve. 1, The spinal cord. 2, The medullaoblongata. 3, The lower part of the brain. 4, The auditory nerve. 5, A branch toIhe semicircular canals. G, A branch to the cochlea. 962. The auditory nerve enters the temporal bone uponits interftal surface, and divides into two branches, at the bot-tom of the cavity of the interndl ear. These branches enterthe structure of the elongated sacs and membranous labyrinth,,radiating ia all directions, and finally, they terminate uponthe inner surface of the membrane, in minute papillae, resem-blin2 those of the retina. By what is the internal labyrinth lined ? 961. Describe the membranouslabyrinth. What does fig. 147 represent ? 962. Where does the auditorynerve enter and divide? Where do the of the auditory nerveenter and terminate ? 420 ANATOMY, PHYSIOLOGY, AND RYGIENE. CHAPTER XLVII. PHYSIOLOGY OF THE ORGANS
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