摘要
脉络膜毛细血管具有不同于身体其它部位毛细血管的特殊结构,其来自于脉络膜中层血管,位于Bruch膜外,相互间的交通支丰富,形成呈小叶状分布的单层毛细血管网。脉络膜毛细血管和视网膜血管系统是视网膜的两个血供来源。视网膜血管系统供养神经视网膜外网织层内的各层;而视网膜外层,即视网膜色素上皮(RPE)和视杆、视锥细胞则由脉络膜毛细血管网供养,脉络膜毛细血管的阻塞将导致RPE和外层神经视网膜缺血性改变。近年来的研究表明,除血供关系外,RPE还可能产生活性物质影响脉络膜毛细血管的结构和功能;两者关系的失调,在许多致盲性疾病。
The ultrastructure of bovine choriocapillaris was investigated in bovine choroid and isolated choriocapillary samples. The choriocapillaris lies in the layer just outside the Bruch's membrane. The choriocapillary endothelial cells on the side facing Bruch's membrane were found tapering their cytoplasm, with a significant number of fenestrae. The fenestrae were predominately located in the choriocapillaris at the posterior pole, rather than at the periphery, of the eyeball. The endothelial cells on the side facing the sclera kad few fenestrae, and the nuclei of endothelial cells and pericytes were located on this side. It was found that on the peripheral part of the choroid, the basement membranes of either choriocapillary endothelial cells or those of pericytes take part in composing the outer part of the Bruch's membrane. The isolated choriocapillaris revealed a typical lobular pattern of capillaries arranged in a radiating fashion.Intercellular junctions and/or cell contacts among endothelial cells and pericytes were also investigated.
出处
《中国医学科学院学报》
CAS
CSCD
北大核心
1993年第3期225-229,共5页
Acta Academiae Medicinae Sinicae
