. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ed into two passages, by means of a bony and membra-nous plate. At the extremity of the modiolus, the two pas-sages communicate with each other. At the other extremity,one opens into the vestibule ; the other into the tympanum, by 955. What passes through the small openings of the middle ear ?956. Of what does the labyrinth consist ? Give the parts of the internalear. 957. Describe the vestibule. 958. What is said of the semicircularcanals ? 959. Why is the cochlea so called ? Of what does it con
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ed into two passages, by means of a bony and membra-nous plate. At the extremity of the modiolus, the two pas-sages communicate with each other. At the other extremity,one opens into the vestibule ; the other into the tympanum, by 955. What passes through the small openings of the middle ear ?956. Of what does the labyrinth consist ? Give the parts of the internalear. 957. Describe the vestibule. 958. What is said of the semicircularcanals ? 959. Why is the cochlea so called ? Of what does it consist ?9G0. How is the interior of the canal of the cochlea divided ? Where dothey communicate with each other ? ANATOMY OF THE ORGANS OF HEARING. 419 the foramen rotundum. The internal surface of the bony-labyrinth is lined by a fibro-serous membrane. 961. 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. 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 tothe semicircular canals. 6, ^branch to the cochlea. 962. The auditory nerve enters the temporal bone uponits internal surface, and divides into two branches, at the bot-tom of the cavity of the internal ear. These branches enterthe structure of the elongated sacs and membranous labyrinth,radiating in all directions, and finally, they terminate uponthe inner surface of the membrane, in minute papillae, resem-bling 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 branches of the auditory nerveenter and terminate ? 420 ANATOMY, PHYSIOLOGY, AND HYGIENE. CHAPTER XLVII. PHYSIOLOGY OF THE ORGANS
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