MODELS OF THE PANCREAS IN EMBRYOS OF THE PIG, 
RABBIT, CAT, AND MAN. 
BY 
FRED W. THYNG, Pu. D.2 
From the Department of Comparative Anatomy, Harvard Medical Sehool. 
WitH 6 TExt FIGURES. 
The pancreas of mammals is now generally described as arising in the 
embryo from a dorsal pancreas, and a ventral pancreas, the latter often 
being subdivided into a right and a left part. Each embryonic portion 
has its own duct. The duct of the ventral pancreas has been known as 
the duct of Wirsung, for which term the Basle nomenclature substitutes 
“pancreatic duct” (ductus pancreaticus). 'The duct of the dorsal pan- 
creas, formerly known as the duct of Santorini, which becomes secon- 
dary or disappears in man, is called the “accessory pancreatic duct ” 
(ductus pancreaticus accessorius). The elimination of personal names 
is desirable, but the terms substituted may be criticised as applicable 
only to man. The duct of the dorsal pancreas which alone persists in 
the pig cannot properly be called either the pancreatic or the accessory 
pancreatic duct. 
Appreciating this difficulty, Revell, 02, proposed the terms ductus 
hepatopancreatis seu dorsopancreatis, and ductus ventropancreatis. The 
compound terms here introduced are contrary to the principles of the 
Basle nomenclature and are not in good Latin form. The following 
terms avoid these difficulties; they accord with the Basle system, and can 
be used both in human and comparative anatomy. 
LATIN. ENGLISH. 
Ductus pancreatis dorsalis—= Duct of the dorsal pancreas. 
Ductus pancreatis ventralis = Duct of the ventral pancreas. 
These terms will be used in the following pages. Where no emphasis 
upon morphological or embryological relations is desired, the name pan- 
creatic duct is often sufficient. 
1This investigation has been aided by a Bullard Fellowship, established 
in memory of John Ware. 
AMERICAN JOURNAL OF ANATOMY.—VOL. VII. 
