A fibrous layer, for which I propose the name "stratum fibrosum striae," separates the epithelium of the stria vascularis from the spiral ligament (figs. 1, 2, 4 and 5). This fibrous layer is much thicker in the upper middle and apical turns than it is in the basal turn of the cochlea. At all levels some of the fibers of the basilar membrane which extend into the spiral ligament curve upward and merge with the stratum fibrosum striae; indeed, in the apical turn all fibers of the basilar membrane seem to merge with this membrane. The stratum fibrosum striae is described in anatomic literature as a part of the spiral ligament. Fischer1 has even given this layer a special designation, "zone 3 of the spiral ligament." However, histologically it differs markedly from the spiral ligament and in extent it corresponds exactly with the epithelial portion of the stria
BELEMER JJ. THE VESSELS OF THE STRIA VASCULARIS: WITH SPECIAL REFERENCE TO THEIR FUNCTION. Arch Otolaryngol. 1936;23(1):93–97. doi:10.1001/archotol.1936.00640040100009
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