THE KIDNEY AND URINARY PASSAGES. 



169 



155, e). Fromtheperiphery 

 of the latter a rounded net- 

 work of somewhat wider 

 vessels extends to the con- 

 voluted uriniferous canals 

 of the cortical pyramids 



(Fig. 153,/; Fig. I55,£-)- 

 The most external cor- 

 tical layer, Hyrtl's cortex 

 corticis, receives its blood 

 from the efferent vessels 

 of the uppermost glome- 

 ruli and the terminal 

 branches of the coil-bear- 

 ing arteries (Fig. 155, d). 

 Let us pass to the veins 

 of the cortex. Stellate 

 venous rootlets, the so- 

 called stellulae Verheyenii 

 {e), appear quite superfi- 

 cially. Connected with 

 these stars, there is then 

 formed in the cortical 

 pyramids a long venous 

 trunk (/{), which lies in 

 close apposition to the 

 coil-bearing artery. Into 

 its regular lateral branches 

 open the rounded capil- 

 lary net-work of the cor- 

 tical pyramids. The vein, 

 itself, sinks at the margin 

 between the cortex and 

 medulla, into the venous 

 arched vessel which we 

 mentioned above. 



Thus far all is settled. 

 8 



Fig. 155. — The vascular arrangement of the kidney in 

 vertical section; (7,arterial branch at the margin between 

 the cortex and medulla ; i>, coil-bearing artery ; c, vasa 

 afferentia of the glomeruli ; d, capillary reticulum of the 

 external cortical layer ; c, vein of this p;irt ; f, elongated 

 capillary net-work of the medullary rays ; g, rounded 

 net-work around the convoluted uriniferous canals of the 

 cortical pyramids ; h, venous branch of the cortex ; z, 

 efferent vessels of the deepest glomeruli ; /■. their capil- 

 lary net-work ; /, venous tubes of the medulla ; «', 

 capillary net-work of the papilla. 



