. Human physiology. alled ca?ia: or infundi- bulum; this receivesthe urine from the pa-pilla, and conveys itinto the pelvis of thekidney, which may beregarded as the com-mencement of theureter. The cortical partof the kidney is themost vascular; and theplexus formed by thetubuli uriniferiappearsto come there in closestrelation with that form-ed by the renal capil-laries. The corporaMalpigkiana or Mal-pighian bodies appearas points in the corticalsubstance. They arescattered through theplexus formed by thebloodvessels and urini-ferous tubes. Eachone, when examinedby a high magnifyingpower, is f
. Human physiology. alled ca?ia: or infundi- bulum; this receivesthe urine from the pa-pilla, and conveys itinto the pelvis of thekidney, which may beregarded as the com-mencement of theureter. The cortical partof the kidney is themost vascular; and theplexus formed by thetubuli uriniferiappearsto come there in closestrelation with that form-ed by the renal capil-laries. The corporaMalpigkiana or Mal-pighian bodies appearas points in the corticalsubstance. They arescattered through theplexus formed by thebloodvessels and urini-ferous tubes. Eachone, when examinedby a high magnifyingpower, is found to con-sist of a convolutedmass of minute blood-vessels. In them—itwas at one time sup-posed—the uriniferoustubes originate; butthe examinations ofMiiller and Iluschkehave seemed to show,that they are only capa-ble of injection fromthe arteries or are found in thekidneys of most, if notall, of the the cortical sub-stance, according to Wagner,^ the tubuli can be traced, although with. Small Portion of Kidney magnified 60 diameters. 1. Csecal extremity of a tubulus. 2, 2. Loops of tubuli. 3, 3. Bifureated tubuli. 4, .5, 6. Tubuli converging towards the papillse. 7, 7, 7Corpora Malpigkiana. 8. Arterial trunk. Elements of Physiology, by R. Willis, § 193, Lond., 1842. OF THE KIDNEYS. 555 difficulty, winding among the vascular plexuses or skeins, mostly loopedtowards the margin of the organ, and running into one another, orhaving blind or cascal extremities; more rarely enlarged and club-shaped, and occasionally cleft. The entire cortical substance, accordingto Wagner, consists of convolutions of the uriniferous tubes, whichpresent a nearly uniform diameter, on an average, from about the 60thto the 50th of a line. Professor Goodsir,^ however, without denying
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