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Ultrastructure of the neurohypophysis of the teleost Poecilia latipinna in relation to neural control of the adenohypophysial cells

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Summary

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.

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  1. T. F. C. Batten

    Present address: Department of Histology and Cell Biology (Medical), University of Liverpool, P.O. Box 147, L69 3BX, Liverpool, England

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  1. Department of Zoology, University of Sheffield, England

    T. F. C. Batten &  J. N. Ball

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  1. T. F. C. Batten
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We thank Mr. W.A. Thomson and Mr. D.I. Hollingworth for technical assistance, and Dr. D.I.C. Pearson (Department of Physics, University of Nancy, Nancy, France) for advice on mathematical analysis and computer programs. The work was carried out during the tenure of an S.R.C. Research Studentship by T.F.C.B.

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Batten, T.F.C., Ball, J.N. Ultrastructure of the neurohypophysis of the teleost Poecilia latipinna in relation to neural control of the adenohypophysial cells. Cell Tissue Res. 185, 409–433 (1977). https://doi.org/10.1007/BF00220300

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