76 
left, giving branches to the fused area of the caudal lobes and ter- 
minates in the left one of these lobes. The smaller A. renalis sinistra 
separates into two short branches that re-divide and distribute to both 
lobes of the left side. 
The following additional points may be noted in connection with 
the arterial system. The A. mesenterica superior arises further caudad 
than is normally the case, being posterior to the Aa. renales. A 
smaller median artery is given off from the aorta just anterior to it, 
the identity of which is uncertain as the abdominal viscera had prev- 
iously been removed and its distribution could not be learned. No 
trace of the A. mesenterica inferior was found at the usual place for 
this vessel, and it was not accounted for elsewhere; likewise the Aa. 
spermaticae internae. 
The Vena cava inferior exhibits one of the more frequent 
anomalies of this vessel, being double in its posterior half. The two 
veins here formed (cardinals) 
lie on the ventral surface of 
the kidneys, and opposite the 
>=. A.adr.lumb space between the renal lobes: 
of each side receive the renal 
\ Arendex Veins. There are two of these 
on each side, one for each 
lobe, and they enter the car- 
dinal separately. 
A longitudinal incision 
through the right renal lobes 
and through the wall of the 
Fig.3. Diagram showing character of the pelvis shows that the renal 
renal arteries of the horseshoe kidney. Seen papilla of the posterior lobe 
Ira aoe dosh ee tec. forms a drawn-out mass, which,. 
at a point opposite the opening 
of the ureter into the renal pelvis, meets and is continuous with a 
similar smaller renal papilla from the anterior lobe, so that the two 
lobes of the kidney are bound together by a rather slender stalk of 
medullary substance. This stalk takes a direct cephalo-caudal direction 
from one lobe to the other, and on its median surface, midway be- 
tween the two lobes and opposite the opening of the ureter, is a small 
depression or pore through which the collecting tubules of both lobes: 
discharge into the renal pelvis. On the left side a similar condition 



...Ao.ab 
