. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE KIDNEYS. 4S7 Proper TissTTE.—The glandular tissue of the kidneys (areola parendhvma or matrix) has externally, a reddish-brown colour, more or less deep in different individuals. It is dense and friable, and easily torn when deprived ot Its hbrous capsule. Its substance is not everywhere homoeeneousT very dark-coloured externally, where it forms the cortical layer, it becomes wniter around the pelvis, where it consitutes the medullary layer ; where the latter comes m contact with the former, and sometimes even near
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE KIDNEYS. 4S7 Proper TissTTE.—The glandular tissue of the kidneys (areola parendhvma or matrix) has externally, a reddish-brown colour, more or less deep in different individuals. It is dense and friable, and easily torn when deprived ot Its hbrous capsule. Its substance is not everywhere homoeeneousT very dark-coloured externally, where it forms the cortical layer, it becomes wniter around the pelvis, where it consitutes the medullary layer ; where the latter comes m contact with the former, and sometimes even near the pelvis, it assumes a tint like that of wine. These two portions are not well defined, but penetrate each other reciprocally, so as to compose, at their point of junction, irregular festoons, very readily perceived in a horizontal section of the kidney (Fig. 248). The cortical is also distinguished from the medullary substance by its granular aspect, and the presence of minute, reddish spheres, readily visible to the naked eye, and named MalpigUan corpuscles ; while the medullary substance appears composed of radiating fibres. Fig. HORIZONTAL LONGITUDDTAL SECTION OF THE HOESe'S KIDNEY. a, Cortical (oi' vascular) portion ; 6, Medullary (or tubular) portiou; c, Peripheral portion of the latter; d, Interior of the pelvis; d', d'. Arms of the pelvis; e Border of the crest; /, Infundibulum ; g, Ureter. In the Horse, the tissue of the kidney cannot be divided into lobules or pyramids ; to the naked eye it appears to be composed of fibres that start from every part of its exterior, and converge towards the crest of the pelvis. A microscopical examination demonstrates these fibres to be canals or tubes ; hence they are designated tuhuli uriniferi or Bellini's tubes. A delicate connective tissue, a kind of stroma, which is very rare in the cortical, but more abundant in the medullary substance, especially in the vicinity of the pelvis, sustains the vessels and nerves, and uni
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