KIDNEYS. 



meshes of this network. From it arise small veins which open 

 into the interlobular veins. These run parallel with the inter- 

 lobular arteries, and at the boundary between the medulla and 

 cortex open into the arcuate veins. Into the most peripheral 



FIG. 170. 



The renal artery and the distribution of its branches in relation to the pelvis. 

 (Brodel.) Anterior viewjjf a left kidney. There are six main branches seen entering the 

 kidney substance. Only one of these (the third) passes posterior to the pelvis at the 

 hilum ; also small arteries coming from the upper and lower main branches are seen to pass 

 posterior to the upper and lower calyces. All the rest of the arteries pass anterior to the 

 pelvis and its calyces. The small branches to the cortex of the anterior portion of the 

 kidney have not been drawn, in order that the large branches and the pelvis might appear 

 more distinctly. 



part of the interlobular veins there run small veins from the 

 surface. These possess radial, star-like tributaries on the 

 surface, and are known as the stellate veins of Verheyn (Fig. 

 165). 



The medullary substance is supplied partly by capillary 

 branches from the cortex, and partly from the arteriolce rectce. 

 The latter are branches partly from the vasa efferentia of the 



