Aharinejad S, Lametschwandtner A, Böck P, Firbas W
First Department of Anatomy, University of Vienna, Austria.
Anat Rec. 1994 Jul;239(3):280-6. doi: 10.1002/ar.1092390306.
The microvascular pattern of the duodenal papilla is unknown. Since the duodenal papilla is located in the transition zone between the stomach and duodenum, and because it regulates bile transfer into the duodenum, a particular microangioarchitecture can be expected. Therefore, we examined the microvasculature of the papilla using guinea pigs as a model.
The microvascularization of the duodenal papilla and common bile duct was studied in 26 adult guinea pigs (Cavia porcellus), using scanning electron microscopy of microvascular corrosion casts and critical point dried specimens, and light microscopy of tissue sections.
The duodenal papilla is located in the cranial portion of the duodenum, approximately 5 mm beyond the pyloric valve. At the most luminal aspect of the cast papilla, ring-shaped capillaries, resembling those of the cast gastric mucosa, are present. Deeper parts of the papilla are provided with villi. Subepithelial capillaries of the papilla are 15 microns thick in average. These capillaries have a dual blood supply either via the straight long arterioles arising from the submucosa or by the pericryptal capillaries. The common bile duct comprises numerous mucoid glands with their pits surrounded by ring-shaped capillaries in corresponding casts.
The special arrangement of different capillary patterns, together with their luminal size and the dual blood supply, favor their protective role from the gastric chyme.
十二指肠乳头的微血管形态尚不清楚。由于十二指肠乳头位于胃和十二指肠的过渡区域，且其调节胆汁排入十二指肠，因此可以预期其具有特殊的微血管构筑。因此，我们以豚鼠为模型研究了乳头的微血管系统。
采用微血管铸型扫描电子显微镜检查、临界点干燥标本以及组织切片光学显微镜检查，对26只成年豚鼠（豚鼠属）的十二指肠乳头和胆总管微血管进行了研究。
十二指肠乳头位于十二指肠的头侧部分，距幽门瓣约5毫米。在铸型乳头最靠近管腔的一侧，存在类似于铸型胃黏膜的环形毛细血管。乳头较深的部分有绒毛。乳头的上皮下毛细血管平均厚度为15微米。这些毛细血管有双重血液供应，要么通过来自黏膜下层的直的长小动脉，要么通过隐窝周围的毛细血管。胆总管包含许多黏液腺，在相应的铸型中，其腺窝被环形毛细血管围绕。
不同毛细血管模式的特殊排列，以及它们的管腔大小和双重血液供应，有利于它们对胃 chyme 的保护作用。
