Textbook of normal histology: including an account of the development of the tissues and of the organs . ng fcetal life, however, the lobules are dis-tinctly seen, a condition which is permanently retained in many ofthe lower animals. The medulla is occupied by 8-18 striated conical Malpighianpyramids, the apices of which correspond to the papillae, while theirbases occupy the line of juncture between the cortex and the medulla. Each pyramid exhibitsFig. 235. alternating light and dark striae, these markingsbeing respectively theuriniferous tubules andthe blood-vessels. Themasses of the organ
Textbook of normal histology: including an account of the development of the tissues and of the organs . ng fcetal life, however, the lobules are dis-tinctly seen, a condition which is permanently retained in many ofthe lower animals. The medulla is occupied by 8-18 striated conical Malpighianpyramids, the apices of which correspond to the papillae, while theirbases occupy the line of juncture between the cortex and the medulla. Each pyramid exhibitsFig. 235. alternating light and dark striae, these markingsbeing respectively theuriniferous tubules andthe blood-vessels. Themasses of the organ ex-tending between the sidesof the Malpighian pyra-mids as far as the pelvisconstitute the columnsof Bertini, and are trav-ersed by the large blood-vessels. At certain points alongtheir bases the striae of theMalpighian pyramids arecontinued into the cortexas slender, tapering bun-dles of parallel tubules,which form the medul-lary rays, or pyramidsof Ferrein. By thepenetration of these bun-dles the cortex is sub-divided into the med-ullary rays and thelabyrinth, the latter ap-propriately so named on. Section of human kidney, including cortex and portion ofmedulla, showing general arrangement of tissues. Cortex(C) is imperfectly subdivided by bundles of parallel tubulesconstituting the medullary rays (m); between these lies thelabyrinth (/) containing the Malpighian bodies (x) ; in places{x) the glomerulus has fallen out, leaving the empty capsule ;b and v, sections of blood-vessels. account of the great tortuosity of the component uriniferous dark-red points irregularly studded over the labyrinth indicatethe position of the Malpighian bodies. In sections parallel tothe free surface the medullary rays appear as groups of tubules sur-rounded by the labyrinth on all sides. The blood-vessels of the labyrinth are enveloped in connectivetissue, which latter represents the interlobular tissue of otherglands and the boundaries of the primary lobules. The secreting THE URINA
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
