WESLEY D. ANDERSON 
797 
COMMON HEPATIC ARTERY - OVINE (right surface) 
COMMON 
HEPATIC A, 
Li. Hepatic a. 
Cranial- Pangreaticodaodenal a 
I -Arteries to Pancreas 
"Ventral Sac 
of Rano-en 
R Gastroeipiploid a 
L. G astroepi-ploiC a. 
L. Gastric! a. 
Figure 34. — Common hepatic artery of sheep (right surface). 
azygos vein in the bovine. What is the collateral 
circulation for that vein? Would you predict 
f the possibility of hydrothorax if one does this? 
Dr. Anderson : Well, the left azygos or the 
hemi-azygos, you know, is the dominant venous 
drainage. There are intracommunications with 
the azygos or the right azygos. I would fear, 
perhaps, the consequences. However, many of 
these collaterals do have a way of opening up 
with time, if the ligation is not complete. How- 
ever, we must be careful about dealing with the 
left azygos or the hemi-azygos in sheep and calf 
and pig. 
Frederick Sperling, Howard University, 
I Washington, D.C.: Could you please elaborate 
' on the statement you made with regard to ligat- 
ing the brachial artery leading to pulmonary 
disease? 
Dr. Anderson: When we first began this 
work in 1969, we were told by the people in the 
artificial heart program that they were having 
problems with respiratory disease following the 
ligation of the brachial artery. They were not 
properly identifying this. Later on, with fur- 
ther dissections, they found that they had been 
disrupting, destroying, or ligating the brachial 
artery. There's some work going on at the 
Veterans' Hospitals throughout the United 
States (I believe Minnesota is one place), in 
which the following theory has been proposed : 
that the segment of aorta from which the two 
or three brachial arteries arise should also be 
