The Choledochoduodenal Junction in Sheep and Goat
The choledochoduodenal junction was studied in 15 sheep, 5 goats and 7 sheep fetuses by maceration technique, microdissection, and by microscopic examination. The bile duct extended from the junction of the hepatic and cystic ducts, entered the duodenum at the beginning of its descending part on the dorsomedial aspect, ran distally in the wall for about 1.5 cm and ended with an opening facing distally without raising a papilla. The average length of the bile duct was 8 cm; its structure along its course was also described.
The terminal parts of the bile and pancreatic ducts and their musculature.
The material for this study consists of nine foetuses varying in C.R. length from 190 to 220 mm. and one full-term foetus. The part of the duodenum bearing the major and minor papillae, and the adjoining part of the pancreas, have been embedded in paraffin and serially sectioned. The sections have been stained by the Masson's trichrome method. In the description that follows that side of the bile or pancreatic duct that lies towards the lumen of the duodenum has been termed the mucosal side. The opposite side, i.e. that towards the pancreas, has been called the pancreatic side.
Ist die Papilla duodeni ein autonomer Sphinkter?
SummaryA morphologic study of the duodenal papilla was performed by laminations in three planes. The muscle system reveals that there are no autonomic sphincters, but muscle bundles deriving from duodenal longitudinal and circular muscle layers, interdigitating and acting for opening of the papillary mouth. Activity results from myogenous rhythmic contractions of smooth muscle cells, stimulated by the ductal hydrostatic pressure, and from the duodenal peristalsis. The closure of the papilla is weak, uncomplete and achieved by the oblique entrance of the duct. Interpretation of functional analysis and procedures of treatment should be based upon the knowledge of normal morphology of the papilla.ZusammenfassungUntersuchungen der Papilla duodeni durch histologische Serienschnitte in 3 Schnittebenen.Ein autonomes Sphinktermuskelsystem liegt nicht vor, vielmehr wird die Papillenmuskulatur aufgebaut von Muskelbündeln aus der Längs- und Ringmuskulatur der Tunica muscularis duodeni, die sich durchflechten und primär eine öffnende Wirkung auf die Papillenmündung erzielen. Die Papillenaktivität beruht auf myogenen Sekundenrhythmen glatter Muskelzellen, ausgelöst durch den hydrostatischen Druck im Choledochus, und erfolgt andererseits im Rahmen der Duodenalperistaltik. Der Papillenverschluß ist schwach und unvollständig und wird durch die schräge Einmündung des Choledochus erzielt. Funktionsanalytische Deutungen und Behandlungsverfahren sollten unter der Kenntnis der normalen Morphologie der Papille erfolgen.