Bonghan ducts on the surface of rat liver

Biomedical Physics Laboratory, School of Physics, Seoul National University (Seoul, Korea)
Threadlike structures that moved freely and were sparsely fixed on the surfaces of various lobes of rat livers were observed. These structures were morphologically in accordance with Bonghan Kim's descriptions about the organ-surface Bonghan ducts. The ducts were transparent, and the thickness varied from 30 to 60. There were also corpuscles connected by the ducts and the ducts often divided into two or more branches that were the characteristic features of Bonghan network on the surface of internal organs. By Feulgen reaction we found that streams of Bonghan granules flowed through the Bonghan duct. Thus the bundle structure of the Bonghan duct was observed.