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Efferent projections from the lateral septal nucleus to the anterior hypothalamus in the rat: A study combining Phaseolus vulgaris-leucoagglutinin tracing with vasopressin immunocytochemistry

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Summary

The tracer Phaseolus vulgaris-leucoagglutinin (PHA-L) was injected into the lateral septum of the rat at different rostrocaudal locations to study the efferent septal projections to the anterior hypothalamus. For spatial correlation of these septofugal elements with the vasopressinergic system a dual immunocytochemical technique was used (i) to demonstrate nerve fibers and their corresponding bouton-like structures labeled with the tracer, and (ii) to identify vasopressin in the same section. The hypothalamic paraventricular and supraoptic nuclei, the accessory hypothalamic magnocellular system, and the suprachiasmatic nucleus are recipients of PHA-L-labeled fibers from all parts of the lateral septum. Close appositions between (i) these axons and their varicosities, and (ii) vasopressin-immunoreactive perikarya and their processes, putatively indicating functional interrelationships, were observed in all these nuclear areas, especially in their neuropil formations.

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Abbreviations

F :

fornix

OC :

optic chiasm

OT :

optic tract

PVN :

paraventricular nucleus

SCN :

suprachiasmatic nucleus

SON :

supraoptic nucleus

III :

third ventricle

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Staiger, J.F., Wouterlood, F.G. Efferent projections from the lateral septal nucleus to the anterior hypothalamus in the rat: A study combining Phaseolus vulgaris-leucoagglutinin tracing with vasopressin immunocytochemistry. Cell Tissue Res 261, 17–23 (1990). https://doi.org/10.1007/BF00329434

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  • DOI: https://doi.org/10.1007/BF00329434

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