Chiba A, Honma Y
Arch Histol Jpn. 1981 Mar;44(1):87-93. doi: 10.1679/aohc1950.44.87.
The extraregional occurrence of saccus vasculosus tissue was observed in the neurohypophysis of several specimens of three species of plectognath fishes, Fugu niphobles. Fugu poecilonotus and Canthidermis rotundatus. The ectopic tissue occurred as a compact multitubular structure in the posterior portion of the pars nervosa, either being buried in it or attaching to its dorsal margin. Scanning electron microscopy revealed that ectopic crown cells of F. niphobles were distributed further in the ependymal layer of the infundibulum. A possible route of these crown cells to the neurohypophysis was discussed with special reference to the close anatomical relationship between the neurohypophysis and the saccus vasculosus in the embryonic stage.
在三种鲀形目鱼类（黑斑叉鼻鲀、星斑叉鼻鲀和圆斑皮剥鲀）的几个标本的神经垂体中观察到了血管囊组织的区域外出现情况。异位组织在神经部后部呈现为紧密的多管状结构，要么埋于其中，要么附着于其背缘。扫描电子显微镜显示，黑斑叉鼻鲀的异位顶细胞在漏斗的室管膜层中分布得更远。特别参考胚胎期神经垂体与血管囊之间紧密的解剖关系，讨论了这些顶细胞到达神经垂体的可能途径。
