468 



THE HUMAN BODY 



The final twigs of the renal artery in the cortex, giving off a few 

 branches which end in a capillary network around the convoluted 

 tubules and in the pyramids, are continued as the afferent ves- 

 sels of Malpighian capsules, the walls of which are doubled in be- 

 fore them (Fig. 140) ; there each breaks up into a little knot of 



2' 



FIG. 139. Section through the right kidney from its outer to its inner border, 

 1, cortex; 2, medulla; 2', pyramid of Malpighi; 2", pyramid of Ferrein; 5, small 

 branches of the renal artery entering between the pyramids; A, a branch of the 

 renal artery; D, the pelvis of the kidney; U, ureter; C, a calyx. 



capillary vessels called the glomerulus, from which ultimately 

 an efferent vessel proceeds. Where the wall of the capsule, w, 

 Fig. 140, is doubled in before the blood-vessels, its lining cells 

 continue as a covering, c, to the latter, closely adhering to the 

 vascular walls. A space, A, is left between the epithelial cells of 

 the outside of the capsule and those involuted on the vessels, as 



