Elsevier

Brain Research

Volume 239, Issue 2, 13 May 1982, Pages 583-588
Brain Research

Reciprocal connections between the amygdala and parabrachial nuclei: ultrastructural demonstration by degeneration and axonal transport of horseradish peroxidase in the cat

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Abstract

An ultrastructural analysis of the connections of the amygdala with the parabrachial nuclei (PBN) was carried out after electrolytic lesions or injections of horseradish peroxidase in the amygdala. Degenerating and labeled terminals originating from the amygdala formed axosomatic and axodendritic synapses in the PBN. In some instances, anterograde labeled terminals synapsed with retrogradely labeled neurons. These results demonstrate that the amygdala and PBN have close reciprocal synaptic connections.

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    This work was supported by the Medical Research Council of Canada and A Killam Postdoctoral Fellowship.

    1

    The authors would like to thank Mr. P. Wilkinson and Mr. G. Allen for technical assistance and Ms. C. Anjowski and Ms. P. Rowter for typing the manuscript. Dr. J. Rutherford made helpful suggestions regarding the manuscript.

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