Matsunaga T, Kanzaki J, Hosoda Y
Department of Otolaryngology, School of Medicine, Keio University, Tokyo, Japan.
Hear Res. 1996 Nov 1;101(1-2):119-31. doi: 10.1016/s0378-5955(96)00141-4.
The vasculature of the peripheral portion of the human eighth cranial nerve (VIIIN) was investigated by light and transmission electron microscopy. Arterioles and venules running longitudinally around the VIIIN formed the extrinsic vascular system. The anatomical relationship between these extrinsic vessels and the VIIIN sheath was similar to that between blood vessels on the surface of the brain and the pia mater. In the endoneurium, postcapillary venules and large capillaries were sparsely distributed and longitudinally arranged, and these microvessels formed the intrinsic microvascular system, which was supported by the extrinsic vascular system via anastomosing vessels. The ultrastructural features of the internal auditory artery and its main branches were the same as those of other intracranial arteries. Ultrastructural study also revealed myo-endothelial junctions in anastomosing arterioles, and endothelio-pericytic junctions in extrinsic and anastomosing venules. Microvascular endothelial cells were connected by tight junctions in both the vestibular ganglion and the rest of the VIIIN. These features of the vasculature were considered to be effective for maintenance of the endoneurial fluid and regulation of the circulation in the peripheral portion of the human VIIIN.
通过光学显微镜和透射电子显微镜对人类第八对脑神经（VIIIN）外周部分的脉管系统进行了研究。围绕VIIIN纵向走行的小动脉和小静脉形成了外在血管系统。这些外在血管与VIIIN鞘之间的解剖关系类似于脑表面血管与软脑膜之间的关系。在神经内膜中，毛细血管后微静脉和大毛细血管稀疏分布并纵向排列，这些微血管形成了内在微血管系统，该系统通过吻合血管由外在血管系统提供支持。内听动脉及其主要分支的超微结构特征与其他颅内动脉相同。超微结构研究还揭示了吻合小动脉中的肌内皮连接，以及外在和吻合小静脉中的内皮周细胞连接。微血管内皮细胞在前庭神经节和VIIIN的其余部分通过紧密连接相连。脉管系统的这些特征被认为对维持人类VIIIN外周部分的神经内膜液和调节循环有效。
