. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. Fig. 76. Membranous labyrinth of thrush (Turdtts), after Retzius, from Wiedersheim. aa, anterior ampulla; ac, eighth nerve; ap^ posterior ampulla; ca, anterior canal; c£^ ex- ternal canal; cp^ posterior canal; de^ ductus en- dolymphaticus; /, lagena; mti, macula neglecta; WJ, macula sacculi; viu, macula utriculi; //, papilla lagen;e; raa, nerve to anterior ampulla ; rap, to posterior ampulla; rb, basilar nerve: rec, recessus utriculi; rl, nerve to lagena; r«, nerve to macula neglecta; s, sacculus; sc, septum conciatum; sp, p
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. Fig. 76. Membranous labyrinth of thrush (Turdtts), after Retzius, from Wiedersheim. aa, anterior ampulla; ac, eighth nerve; ap^ posterior ampulla; ca, anterior canal; c£^ ex- ternal canal; cp^ posterior canal; de^ ductus en- dolymphaticus; /, lagena; mti, macula neglecta; WJ, macula sacculi; viu, macula utriculi; //, papilla lagen;e; raa, nerve to anterior ampulla ; rap, to posterior ampulla; rb, basilar nerve: rec, recessus utriculi; rl, nerve to lagena; r«, nerve to macula neglecta; s, sacculus; sc, septum conciatum; sp, posterior utricular sinus : .^.^, superior utricular sinus; tv, tegmentum va^culo- sum; «, utriculus. Fig. 77. -Section through the cochlea of a cat. Bone, shaded. C, organ of Corti; t?, spiral ganglion; A', nerve; , ST, SI', scalae media, tympani, and vestibuli; R, Reissner's membrane. cartilage, but in all except the lower vertebrates the cartilage is finally replaced by bone. The inner walls of these capsules follow more or less closely the contour of the membra- nous labyrinth, thus con- stituting the skeletal labyrinth, between which and the membranous por- tions is a space filled with the perilymphatic fluid. The walls of these cap- sules are perforated in- ternally for the passage of nerves, etc., while on their lateral surfaces, in all groups above amphibia, are two openings, — the fenestra ovalis and the fenestra rotunda (the lat- ter crossed by mem- branes),— through which sound waves pass to the parts described. In the mammals the skeletal labyrinth follows very closely the membra- nous portion, and in one part these structures need a further description. That part called the la- gena in the lower verte- brates is greatly devel- oped here, and is drawn out and coiled in a spiral, which is accompanied,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of the
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