. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Ports of Entry 797 ampullaris in the ampulla of each semicircular canal, as already described; the macula utriculi in the wall of the utriculus; the macula sacculi, in that part of the sacculus that is not drawn out to form the cochlear duct; and the organ of Corti in the cochlear duct (Fig. G96). The cristae and maculae are innervated by the vestibular branch of the acoustic (VHIth) nerve while the organ of Corti is supplied by the cochlear branch of the
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Ports of Entry 797 ampullaris in the ampulla of each semicircular canal, as already described; the macula utriculi in the wall of the utriculus; the macula sacculi, in that part of the sacculus that is not drawn out to form the cochlear duct; and the organ of Corti in the cochlear duct (Fig. G96). The cristae and maculae are innervated by the vestibular branch of the acoustic (VHIth) nerve while the organ of Corti is supplied by the cochlear branch of the same nerve. Helicotrema ^^-Modiolus *"«S^—— Scala Vestibuli Bony Spiral Lamina Spiral Ligament—1 TwTVwv—Cochlear Duct Spiral Ganglion''" Nv| Cochlear Nerve. L/& "Scala Tympani vWall of Sacculus -^-Vestibular Ganglion Auditory Nerve—^ Fig. 697. Axial section through a decalcified cochlea of a new-born child. (After Toldt.) In the adult human ear, only a slender tube, the utriculosaccular duct connects the utriculus with the sacculus. From this duct a slender endolym- phatic duct extends to the inner surface of the petrous bone where it en- larges into the endolymphatic sac lying just beneath the dura. The sacculus is also connected with the cochlear duct by a slender canal, the ductus reuniens. The bony cochlear canal, in which lies the cochlear duct, spirals about a conical axis, the modiolus (Fig. 697). From the modiolus a shelf of bone, the spiral lamina, projects into the canal, somewhat like the thread of a screw. Extending along the opposite wall of the canal is the spiral ligament, a thickened portion of the periosteum. In cross sections of the cochlea the cochlear duct appears triangular. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Walter, Herbert Eugene, b. 1867; Say
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
