Miller—Distribution of the Bile Ducts of the Cat. 623 
A duct formed by branches coming from the left median and 
the left lateral lobe is called the ductus hepaticus sinister. 
The ductus hepaticus dexter et sinister may continue as sep^ 
arate ducts and join, either the ductus cystieus or the ductus 
choledochus. If, however, they should unite into a single duct, 
the resulting duct is called the ductus hepaticus proprius. 
The ductus choledochus is considered as beginning at the point 
of entrance of the ductus hepaticus dexter et sinister. If either 
of these ducts enters below the other, then the ductus choledochus 
is considered as beginning at the point of entrance of the lower 
duct. 
The duct leading out of the vesica fellea is called the ductus 
cystieus. 
v MET.HOD OF STUDY. 
After the ductus choledochus and the ducti hepatici had been 
exposed by a careful dissection the bile (fel) w 7 as expressed 
from the vesica fellea and the exposed ducti hepatici by direct 
pressure with the finger. The duodenum was next opened, its 
surface washed clean and the cannula of a syringe filled with a 
vermilion starch injecting mass was inserted into the orifice of 
the ductus choledochus and the'injection was continued until the 
ducts were well filled with the mass. 
Each liver was carefully dissected and a drawing of each dis¬ 
section was made upon a standard diagram of the lobes of the 
liver. The very small anastomoses which were occasionally 
seen ( PI. XLIX, Fig. 1) were ignored in the analysis. When two 
or more ducts were found leaving one lobe for different desti¬ 
nations, each destination was recorded. (See ducts from qua¬ 
drate lobe in Plate XLIX, Fig. 2.) If, however, two or more 
ducts from one lobe had the same destination, they were recorded 
as one. (See in text, Fig. 2, the ducts from the left median 
lobe.) In general a smaller duct was said to join a larger, but 
in one case an arbitrary ruling had to be made. The ducts from 
the cranial and caudal divisions of the right lateral lobe were 
often apparently of equal size. When they were unequal in size 
the duct from the caudal division was generally the larger. The 
ruling was therefore made that when these two ducts joined, the 
cranial duct was always considered as joining the caudal duct. 
