用注射复型扫描电镜方法观察足月胎儿胆囊微血管的构筑

用甲基丙烯酸甲酯铸型方法,将胎儿胆囊壁微血管制成铸型扫描电镜样品,脱水、干燥后,用EIKO IB-3型离子镀膜仪镀膜,在扫描电镜下观察。胆囊壁微血管明显分为三层,即浆膜层血管、肌层血管和粘膜层血管。其中浆膜和肌层血管与肠管壁相应层次的血管结构类似。而粘膜层血管则被分为两部分,一部分紧贴上皮细胞下,有一层丰富的毛细血管网;另一部分在固有膜内有管径粗大的静脉丛。毛细血管网与静脉丛之间直接以毛细血管相连。微动脉的数量相对较少,穿行于静脉丛之间,并逐级分支延续于毛细血管网。本文未见有动、静脉吻合。但在微动脉与静脉丛之间,常见有构成功能性毛细血管短路的毛细血管性交通支。

OBSERVATIONS ON THE VASCULAR ARCHITECTURE OF THE GALL-BLADDER IN THE FULL TERM FETUS UNDER THE SCANNING ELECTRON MICROSCOPE

The SEM specimens of the blood vessels of the gall-bladder in the full term fetus were produced with the methyl methacrylate cast. The specimens were dryed and gilded with EIKO. IB-3. and then observed under scanning electron microscope. The microvessels of the wall of gall-bladder obviously were divided into three layers, namely: serous vessels, muscular vessels and mucous vessels. The serous and muscular vessels are similar to that of the intestinal canal. However the mucous vessels were characterized by subepithelial capillary networks and veins of large calibre in the lamina propria. The capillary networks were connected directly with the venous plexus by the capillaries. There are fewer arterioles passing and branching among the venous plexuses. Each arteriole was connected to capillary networks. The short capillary was seen frequently between the arterioles and the venous plexus, serving as communication between them.