. Text-book of normal histology: including an account of the development of the tissues and of the organs. dinglimb as far as the succeed-ing portion of the tube. 7. Tile irregular tubuleis distinguished by its smalland uncertain lumen andits distinctly striated epi-thelium ; the thickness ofthe latter and, conse-quently, the size of thecanal vary with the con-ditions of secretion. 8. The lining of the dis-tal convoluted tubuleresembles that of the proxi-mal, the epithelium beinggranular, indistinctly sepa-rated into individual cells,and presenting a striatedouter zone; the lumen ofthe canal d
. Text-book of normal histology: including an account of the development of the tissues and of the organs. dinglimb as far as the succeed-ing portion of the tube. 7. Tile irregular tubuleis distinguished by its smalland uncertain lumen andits distinctly striated epi-thelium ; the thickness ofthe latter and, conse-quently, the size of thecanal vary with the con-ditions of secretion. 8. The lining of the dis-tal convoluted tubuleresembles that of the proxi-mal, the epithelium beinggranular, indistinctly sepa-rated into individual cells,and presenting a striatedouter zone; the lumen ofthe canal depends largely upon the thickness of the lining cells, which changes with the func-tional activity of the secretory elements. 9. The succeeding segment, the arched collecting tubule, con-tains low cuboidal, transparent cells, which, with slight alteration,become the epithelium of the straight collecting tubule. 10. Passing into the medulla, the cells of the collecting tubulesbecome markedly columnar, which form they retain with increasingdistinctness throughout the remainder of their course. The large. >^-)f., Section of medulla of human kidney : zv, large collect-ing tubules ; jr and_j, descending and ascending limbs ofHenles loops ; z, loops of Henle ; v, blood-vessels. THE URINARY ORGANS. 199 Fig. 242.
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