. The chordates. Chordata. Comparative Morphology of Chordates known as the organ of Corti (Fig. 517). This "organ" extends from base to apex of the spiral. Its histologic elements include certain curious rodlike cells (pillar cells or rods of Corti) arranged in parallel series on either side of a "tunnel," their expanded bases resting upon the basilar membrane (membrana basilaris) of the organ. At either- side of the double row of pillar cells are the sensory cells, which are short and do not extend down to the membrana basilaris. Each sensory cell bears, on its free
. The chordates. Chordata. Comparative Morphology of Chordates known as the organ of Corti (Fig. 517). This "organ" extends from base to apex of the spiral. Its histologic elements include certain curious rodlike cells (pillar cells or rods of Corti) arranged in parallel series on either side of a "tunnel," their expanded bases resting upon the basilar membrane (membrana basilaris) of the organ. At either- side of the double row of pillar cells are the sensory cells, which are short and do not extend down to the membrana basilaris. Each sensory cell bears, on its free end, numerous fine stiff processes or "hairs" which look like cilia but probably are not motile. In addition to the pillar cells and "hair cells," the organ contains cells of several other types, probably serving merely as supporting elements. The basilar. Cochlear branch of tne acoustic nerve Fig. 515. Axial section of the cochlea of a cat. In the axis is the cochlear branch of the acoustic nerve blackened by osrnic acid. Lateral branches of the nerve may be traced to the spiral ganglions where the nerve-fibers arise. At the apex of the cochlea is the helicotrema affording communication between the two perilymph spaces (scalae). (dc) Ductus cochlearis; (set) scala tympani; (scv) scala vestibuli. (X25.) (After Sobotta. Courtesy, Bremer-Weatherford: "Text-Book of His- tology," Philadelphia, The Blakiston Company.). 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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