THE URINARY ORGANS. 

 Fig. 216. 



333 



The blood-vessels and lymphatics of the kidney. G. H. 



I. Transverse vertical section through kidney. Venous system blue; arteries iv,l (Hartn:ick, 



Oe. I, Syst. 3). 

 II. Part of a horizontal section through kidney. Venous system blue; arteries red (Hartnack, 



Oc. I, Syst. 3). 



III. Part of a transverse vertical section through kidney ; lymphatics blue (Hartnack, Oc. I. - 

 A Ventral surface. 

 B Dorsal surface. 

 C Two arterial twigs uniting before entering the Malpighian body. 



,3. The renal veins (p. 247) form a coarse plexus on the ventral 

 surface of the kidney,, from this numerous large branches (Fig. 216 I) 

 course upwards and outwards. 



The venous system between the renal portal veins on the dorsal 

 surface, and the renal veins on the ventral surface, are so large that 

 they can scarcely be named capillaries (Hyrtl). 



y. The renal arteries (p. 233) are distributed to the ventral 

 surface of the kidney ; their mode of distribution varies in different 

 parts of the organ. A simple arrangement is that shown in 

 Fig. 2 1 6 I, where a branch traverses the breadth of the kidney and 

 gives off branches to the Malpighian corpuscles j in one ease (C) 



