MINUTE DISTRIBUTION OF RENAL BLOOD-VESSELS. 



937 



and Hyrtl consider that they take origin in the capillary network of the 

 zone at the base of the pyramids (" neutral zone "). 



Fig. 659. 



Fig. 659. DIAGRAM SHOWING THE RELATION OP THE 

 MALPIGHIAN BODY TO THE URINIFEROCS DUCTS AND 

 BLCOD-VESSELS (after Bowman). 



, one of the interlobular arteries ; a', afferent artery 

 passing into the glomerulus ; in, vascular tuft formed 

 within the glomerulus ; c, capsule of the Malpighiau 

 body, forming the termination of and continuous with t, 

 the uriniferous tube ; e', e' , efferent vessels which sub- 

 divide in the plexus p, surrounding the tube, and finally 

 terminate in the branch of the renal vein e. 



Small veins, arising by numerous venous 

 radicles from the capillary network of the kid- 

 ney, are seen near the surface of the gland, 

 arranged so as to leave between them minute 

 spaces, which appear nearly to correspond with 

 the bases of the so-called pyramids of Ferrein. These vessels, some of 

 which have a stellate arrangement (stellular., Verheyen), joined by numerous 

 branches from the fibrous coat of the kidney, end in larger veins, which again 



Fig. 660. 



Fig. 660. LONGITU- 

 DINAL SECTION OP A 

 PART OF THE TUBU- 

 LAR SUBSTANCE AND 



THE ADJACENT CoR- 



TICAL SUBSTANCE OF 

 THE KIDNEY (from 

 Southey). 



The blood-vessels 

 have been minutely in- 

 jected, and the figure 

 is designed principally 

 to show the origin of 

 the vasa recta. A A, 

 ascending arteries di- 

 vided longitudinally ; 

 G V, cortical veins ; 

 A a, transverse section 

 of anastomotic arch ; 

 ?n, Malpighian bodies ; 

 R, vasa recta ; M V, 

 medullary veins. 



unite into arches 

 round the bases of 

 the pyramids of 

 Malpighi. Here 



they receive the 

 veins of the pyra- 

 mids, which com- 

 mence in a beauti- 

 ful plexus round the orifices of the tubuli on the surface of the papillae. 

 Venous trunks then proceed, in company with the arteries, through the 

 cortical envelope between the pyramids, to the sinus of the kidney. 

 Joining together, they escape from the hilus, and ultimately form a single 



