The development of the human body; a manual of human embryology . * a,. tr * ? Fig. 245.—Section of the Scala Media of the Cochlea of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of scala media; , membrana tec- toria; , vein; 1 to 7, organ of Corti.—{Baginsky.) stance and form the rods of Corti, while the three outerrows (4 to 6) develop into the outer hair cells. It is inconnection with the hair cells that the peripheral pro-longations of the cells of the cochlear ganglion terminate,and since these hair cells are arranged in rows extendingthe entire length of the scala
The development of the human body; a manual of human embryology . * a,. tr * ? Fig. 245.—Section of the Scala Media of the Cochlea of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of scala media; , membrana tec- toria; , vein; 1 to 7, organ of Corti.—{Baginsky.) stance and form the rods of Corti, while the three outerrows (4 to 6) develop into the outer hair cells. It is inconnection with the hair cells that the peripheral pro-longations of the cells of the cochlear ganglion terminate,and since these hair cells are arranged in rows extendingthe entire length of the scala media, the ganglion also is THE INTERNAL EAR. 467. drawn out into a spiral following the coils of the cochlea,and hence is sometimes termed the spiral ganglion. While the various changes described above have beentaking place in the otocyst, the mesoderm surroundingit has also been undergoing development. At first thistissue is quite uniform in character, but later the cellsimmediately surrounding the otocyst condense to give riseto a fibrous layer (Fig. 246, ep) while more peripherallythey become more loosely arranged and form a some-what gelatinous layer {$),and still more peripher-ally a second fibrouslayer is differentiatedand the remainder of thetissue assumes a charac-ter which indicates anapproaching conversioninto cartilage. The fur-ther history of these va-rious layers is as inner fibrous layergives rise to the connect-ive-tissue wall which sup-ports the ectodermal lin-ing of the various por-tions of the otocyst; the gelatinous layer undergoes adegeneration to form a lymph-like fluid known as theperilymph, the spac
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
