The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 THE THIRD DAY. Fig. 33- -pelff' [chap. B â paff' httji Two Views of the membranous Labyrinth of Coldmba domestica (copied from Hasse). A from the extBrior, B from the interior. Aor'horizontal semicircular canal, Aoj-ampulla of ditto, 'pay' posterior vertical semicircular canal, yag ampulla of ditto, /)â¢' anterior vertical semicircular canal, /;⢠ampulla of ditto, it utriculus, r\i recessus utriciili, v the connect- ing tube between the ampulla of the anterior vertical semicircular canal and t
The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 THE THIRD DAY. Fig. 33- -pelff' [chap. B â paff' httji Two Views of the membranous Labyrinth of Coldmba domestica (copied from Hasse). A from the extBrior, B from the interior. Aor'horizontal semicircular canal, Aoj-ampulla of ditto, 'pay' posterior vertical semicircular canal, yag ampulla of ditto, /)â¢' anterior vertical semicircular canal, /;⢠ampulla of ditto, it utriculus, r\i recessus utriciili, v the connect- ing tube between the ampulla of the anterior vertical semicircular canal and the utriculus, de ductus eudolvmphaticus (recessus vestibuh), s sacculus hemisphericus (this is smaller in birds than in any otiier vertebrate), cr canalis reuniens, lag lagena (the dilated extremity of the cochlea), inr membrane of Eeissner, which forms the boimdary between the scala vestibuli and scala media, ph Basilar membrane, which forms the boundary between the scala tympani and the scala media. Tlie coclilea of a bird consists (i) of a scala vestibuli with a very small lumen, which opens at one end into the perilymphatic cavity of the vestibule, and at the other into the lagena (the dilated extiemity of the cochlea corresponding with the cupola of mammals) ; (21 of a scala tympani, also opening into the lagena at one end, and into the foramen rotundum at the other; (3) of a scala media ending blindly at one end, but in communication with the mem- branous vestibule at the othei', through the membranous canalis reuniens (cr). As in maramals, the cavity of the osseous cochlea is divided lengthways by the ductus cochlearis into a scala tympani ending in a foramen rotundum, and a scala vestibuli ending in the cavity of the osseous vestibule, 'which in its turn is connected with the foramen ovale. The auditory nerve, piercing the osseous labyrinth in various points, is distributed in the walls of the membranous labyrinth. All these complicated structures are derived from
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