人体肝外胆管平滑肌和弹力纤维分布的观察

本文时20例人体肝外胆管进行了组织学研究,主要观察各段管壁平滑肌和弹力纤维的分布,结果发现13例(65％)标本查见平滑肌束,其肌束大小,形态不一、排列不规则,呈散在、成簇或成层分布,从上到下肌束逐渐增多,变粗。其余7例(35％)未查见平滑肌层。管壁弹力纤维的结构,一般在粘膜固有层表面较密集,也可呈弥漫性分布,其分布类型与是否存在平滑肌束无明显关系。 管壁的平滑肌组织可证明是胆总管自主运动的形态学基础。而本文未查见平滑肌层者是受实验方法的限制或者不存在平滑肌组织,在这样的标本中如何解释胆总管的自主运动,有待从形态和功能的结合上作进一步研究。

A STUDY OF SMOOTH MUSCLE AND ELASTIC TISSUE OF EXTRAHEPATIC BILE DUCT IN MAN

Presence or absence of smooth muscle in extrahepatic bile duct is controversial Histological studies of extrahepatic bile ducts in 20 persons have been made. It was found that: in their walls muscular layer was present in 13 specimens, and size and shape of muscle bundles were different,, They were in irregular arrangement, and appeared to be scattered, clustered or layer upon layer. In the lower segment of the bile duct, there was a gradual increase in the amount of smooth muscles and coarsened muscle bundles. But muscular elements were not obsererved in other 7 specimens. Elastic fibers of the wall were scattered or crowded in the superficial layer of the muco-derm. There was no relationship between the type of elastic fibers and the structure of the ducts. We believe that there was sufficient smooth muscle in the walls of common bile duct which can produce peristalsis. In the absence of smooth muscle, how to explain their motility is still worthy of further studying.