The development of the human body; a manual of human embryology . Fig. 244.—The Right Internal Ear of an Embryo of Six Months ca, ce, and cp, Anterior, external, and posterior semicircular canals; cr, crista acustica; de, endolymphatic duct; Is, spiral ligament; mb, basilar membrane; ms and nut, macula acustica sacculi and utri- culi; rb, basilar branches of the cochlear nerve.—(Retzius.) their columnar shape, forming two ridges projectingslightly into the cavity of the scala (Fig. 245). Thecells of the inner ridge, much the larger of the two, giverise to the membrana tectoria, either as a cut
The development of the human body; a manual of human embryology . Fig. 244.—The Right Internal Ear of an Embryo of Six Months ca, ce, and cp, Anterior, external, and posterior semicircular canals; cr, crista acustica; de, endolymphatic duct; Is, spiral ligament; mb, basilar membrane; ms and nut, macula acustica sacculi and utri- culi; rb, basilar branches of the cochlear nerve.—(Retzius.) their columnar shape, forming two ridges projectingslightly into the cavity of the scala (Fig. 245). Thecells of the inner ridge, much the larger of the two, giverise to the membrana tectoria, either as a cuticular secre- 39 466 THE DEVELOPMENT OF THE HUMAN BODY. tion or by the artificial adhesion of long hair-like processeswhich project from their free surfaces (Ayers). The cellsof the outer ridge are arranged in six longitudinal rows(Fig. 245, 1-6); those of the innermost row (1) develophairs upon their free surfaces and form the inner hair cells,those of the next two rows (2 and 3) gradually becometransformed on their adjacent surfaces into chitinous sub-.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
