. Quain's elements of anatomy . sj). a). In thetract between this prominence and the membrane of Eeissner, the sub-stance of the periosteum is also fr-equently pigmented, and from con-taining large and numerous blood-vessels, the capihary loops of whichmay even project between the bases of the epithelium-cells, is termedstria vascularis (St. v.). Immediately beneath the epithelium of theouter waU is a basement membrane, through which, in section, cell- 460 THE EAE. processes may here and there be seen passing into the epithelium fromthe subjacent connective tissue. The spiral ligament (fig. 40
. Quain's elements of anatomy . sj). a). In thetract between this prominence and the membrane of Eeissner, the sub-stance of the periosteum is also fr-equently pigmented, and from con-taining large and numerous blood-vessels, the capihary loops of whichmay even project between the bases of the epithelium-cells, is termedstria vascularis (St. v.). Immediately beneath the epithelium of theouter waU is a basement membrane, through which, in section, cell- 460 THE EAE. processes may here and there be seen passing into the epithelium fromthe subjacent connective tissue. The spiral ligament (fig. 400, Lsp) appears in section as a tri-angular prominence attached to the outer wall of the coclilea, with thebasilar membrane prolonged from its apex. It is composed of a retiformconnective tissue, many of the cells of which have an elongated shapeand radiate from the point of attachment of the basilar have been considered by some to be muscular, but there is nodistinct proof of their contractile nature. Fig. Fi?. -Vertical section of the first turn of the cochlea of a child a TEAR AND A HALF OLD. 100 DIAMETERS (Walcleyer). SV, scala vestibuli; ST, scala tympani; DC, duct or canal of the coclilea; ,,„, vestibular and tympanal layer of the osseous spiral lamina with the stratum ofnerve-fibres, N, between ; a, a, outer bony wall of the cochlea ; h, h, and d, periosteum ;e, e, connective tissue thickening forming at the spiral ligament; , striavascularis ; , prominence known as the accessory spiral ligament, containing aspirally running blood-vessel, the vas prominens ; , spiral groove (inner) ; ,so-called external spiral groove ; R, R^, section of Reissners membrane, the middle partindicated only by a dotted line ; from R to Cr., limbus laminse spiralis ; , membranatectoria, somewhat raised up from its natural position ; f—p, organ of Corti; /, nervesturning up to enter epithelium ; g, inner hair-cell regi
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