Batten T F, Ball J N
Cell Tissue Res. 1977 Dec 19;185(3):409-33. doi: 10.1007/BF00220300.
The structure of the neurohypophysis of Poecilia latipinna (green molly, sailfin molly) was studied with the electron microscope. Profile diameters of neurosecretory granules in the non-myelinated neurohypophysial nerve fibres were measured and mathematically corrected for error due to section thickness. Six different types of nerve fibres could be distinguished by statistical classification of their granules and by other ultrastructural features. One fibre-type (type B) contained granules with a mean diameter of 85 nm, and the other five types (types Ala, Alb, A2, A3 and A4) all contained granules with mean diameters greater than 100 nm. Synaptic contacts were observed between type B fibres and all the adenohypophysial cell-types, although in the case of the ACTH cells the synapses were separated from the cell membrane by a continuous double basement membrane. Type A fibres were observed to contact the cells of the proximal pars distalis and pars intermedia, but did not form synapses. However, synapses occurred between type A fibres and pituicytes, and between type A fibres and the pericapillary basement membrane in the interior of the neurohypophysis. The possible roles of the different types of nerve fibres in controlling the adenohypophysial cells are discussed in the context of evidence from other teleosts.
用电子显微镜研究了宽帆食蚊鱼（绿食蚊鱼、帆鳍食蚊鱼）神经垂体的结构。测量了无髓神经垂体神经纤维中神经分泌颗粒的轮廓直径，并对因切片厚度导致的误差进行了数学校正。通过对颗粒的统计分类和其他超微结构特征，可以区分出六种不同类型的神经纤维。一种纤维类型（B型）含有平均直径为85纳米的颗粒，其他五种类型（Ala型、Alb型、A2型、A3型和A4型）都含有平均直径大于100纳米的颗粒。观察到B型纤维与所有腺垂体细胞类型之间存在突触联系，尽管在促肾上腺皮质激素细胞的情况下，突触与细胞膜之间隔着一层连续的双层基底膜。观察到A型纤维与远侧部近端和中间部的细胞接触，但未形成突触。然而，A型纤维与垂体细胞之间以及A型纤维与神经垂体内部的毛细血管周围基底膜之间存在突触。结合来自其他硬骨鱼类的证据，讨论了不同类型神经纤维在控制腺垂体细胞方面可能发挥的作用。
