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Electron microscopical study on the development of the nerve supply of the pituitary pars intermedia of the mouse

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Summary

The development of the nerve supply of the pituitary pars intermedia (PI) of C3H mice was studied by electron microscopy. Nerve fibres and terminal structures, most probably adrenergic, first appear in the newborn. The adult innervation pattern is achieved by the end of the first postnatal week.

In the adult animal two types of nerve terminals were distinguished; type A (peptidergic or neurosecretory) and type B (adrenergic). The peptidergic fibres were scarce and exhibited no synapse-like contacts. It is suggested that they are of secondary importance in a direct nervous hypothalamic control of PI function. Type B terminals were found throughout the PI. They formed synapse-like contacts with the glandular cells, indicating that the primary innervation is exerted by adrenergic neurons.

An autonomous differentiation of the glandular cells and in the adult a combined direct nervous and neurohumoral control of PI function is suggested.

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Authors and Affiliations

  1. Department of Zoology, University of Gothenburg, Gothenburg, Sweden

    Rune Jarskär

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  1. Rune Jarskär
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This investigation was supported by grant No B 2180-026 from the Swedish Natural Science Research Council. The skilful technical assistance of Mrs Ulla Wennerberg is gratefully acknowledged

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Jarskär, R. Electron microscopical study on the development of the nerve supply of the pituitary pars intermedia of the mouse. Cell Tissue Res. 184, 121–132 (1977). https://doi.org/10.1007/BF00220532

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