Bundgaard M
Cell Tissue Res. 1982;226(1):145-54. doi: 10.1007/BF00217089.
Sharks and skates (Chondrichthyes: Elasmobranchii) have a glial blood-brain barrier, while all other vertebrates examined so far have an endothelial barrier. For comparative reasons it is desirable to examine the blood-brain barrier in species from the other subclass of cartilaginous fish, the holocephalans. The ultrastructure of cerebral capillaries in the chimaera (Chondrichthyes: Holocephali) is described in the present study. The endothelial cells are remarkably thick. Fenestrae and transendothelial channels were not observed. The endothelial cells are joined by elaborate tight junctions. The perivascular glial processes are separated by wide spaces (15-60 nm) without obliterating junctional complexes. These findings indicate that the chimaera has an endothelial blood-brain barrier.
鲨鱼和鳐鱼（软骨鱼纲：板鳃亚纲）具有神经胶质血脑屏障，而迄今为止所研究的所有其他脊椎动物都具有内皮屏障。出于比较的原因，有必要研究软骨鱼另一亚纲全头亚纲物种的血脑屏障。本研究描述了银鲛（软骨鱼纲：全头亚纲）脑毛细血管的超微结构。内皮细胞非常厚。未观察到窗孔和跨内皮通道。内皮细胞通过精细的紧密连接相连。血管周围的神经胶质突起被宽阔的间隙（15 - 60纳米）隔开，而连接复合体未被破坏。这些发现表明银鲛具有内皮血脑屏障。
