476 



DISSECTION OF THE ABDOMEN. 



of the two, the afferent vessel (d), is an offset of the renal artery, and 

 divides into convoluted loops of the fineness of capillaries, which form the 

 exterior of the tuft. The other, the efferent vessel (/), begins in the 

 interior of the tuft by the union of the loops on the outer surface ; and 







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Fig 165. 



PLAN OF CONTORTED URINE TUBES ENDING IN 

 MALPIGHIAN CORPUSCLES, which are con- 

 nected with the small arteries (d). 



a. Urine tube. 



6. Malpighiau corpuscles. 



c. Interpyramid^l branch of renal artery 

 (Bowman). 



PLAN OF THE ARRANGEMENT OF THE URINI- 

 FERAL TUBES. 



a. Tube at its ending in the pyramid. 



6. Divisions of the same tube in the pyra- 

 mid. 



d. Arches of Heiile. 



c. Twisted tubes joining the " arches." 



ff. Looped tube of Heale, with its convo- 

 luted part,/, and Malpighian corpuscle, 

 e, in the cortical substance. 



passing out is distributed in a close network of capillaries (<?) on the con- 

 voluted urine tubes ; and in one with elongated meshes on the straighter 

 tubes near the pyramids. The office of the glomerulus is to secrete the 

 watery part of the urine. 



BLOODVESSELS. The artery and vein distributed to the kidney are 

 very large in proportion to the size of the organ they nourish. 



Renal artery. As the artery enters the kidney it divides into four or 

 five branches, which are invested by sheaths of the fibrous capsule, and 

 reach the bases of the pyramids of Malpighi, where they form arches. 

 From those arches arise small interpyramidal branches, which ascend 

 towards the surface, and furnish the afferent twigs to the Malpighian 

 bodies, whose arrangement has been referred to. Other offsets are sup- 

 plied to the capsule and matrix of the kidney ; the former anastomose with 

 the subperitoneal branches of the lumbar arteries. 



Straight vessels descend amongst the tubes in the pyramids of Malpighi, 

 and some form loops like the tubes of Henle. 



Renal vein. This vein begins in the capillary plexuses on the convo- 

 luted urine tubes; and its small branches, receiving twigs from the matrix 



