Éléments d'anatomie du Quain . nvoluted dans le tubule rayons médullaires, andpossesses un épithélium similaires (fig. 568, e). Vers la fin, cependant, les cellules deviennent plus courts et moins fibrillé distinctement, mais upmore split complètement dans les crêtes latérales avec des fmTOws, surtout dans le cadre de l'UEC en regard de la membrane basale, de sorte que les cellules ne bearsomewhat l'aspect de colonnes cannelées profondément à leur base. Betweenthese cellules cannelées, d'autres d'aspect plus claires sont trouvés en montage, et havingan base élargie qui s'étend en partie sous eux. ToSchachowa selon qu'ils sont j^

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Quain's elements of anatomy . nvoluted tubule into the medullary ray, andpossesses a similar epithelium (fig. 568, e). Towards its termination, how-ever, the cells become shorter and less distinctly fibrillated, but split upmore completely into lateral ridges with intervening fmTOws, especially inthe part of the ceU next the basement membrane, so that the cells bearsomewhat the aspect of columns deeply fluted at their base. Betweenthese fluted cells, others of clearer aspect are found fitting in, and havingan expanded base which extends partly underneath them. According toSchachowa they are j^resent also in the convoluted tubules proper.• In the narrow tube which forms the descendmg limb of Ifenles loop, and in the loop itself, the epitheliimi is quite low, and flattened againstthe basement membrane. The protoplasm is clear and the nucleusprominent. The ridge-like processes at the base of the cells are said notto be altogether absent even here. In the ascending limh of the looped tubule the epithelium again takes. 656 THE KIDNEYS. on tlie character which is exhibited in the first convohited and spiraltubes, but the cells are rather smaller, the lumen of the tube relativelylarger, and the intracellular rods not so long as in those tubes. Thecells of this segment are sometimes set obliquely so as to overlap oneanother. In the human subject they contain brown pigment-granules(Klein). In the irregular tuhules on the other hand the rod-like structuie ofthe cells is very distinct (fig. 568, h). The cells are very unequalin size, the irregularity of the tubules being thus compensated, andthe lumen rendered nearly the same throughout. The nucleus isoval. The second convoluted tiibule (intercalary tube of Schweigger-Seidel)Is like the first in size, but has a different kind of epithehum. The cehs, which are rather long, with a relatively large nucleus, present a peculiarhighly refractive appearance, and where they rest on the membranapropria, the protoplasm exhibits projecti

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