Elsevier

Neuroscience Letters

Volume 271, Issue 3, 27 August 1999, Pages 175-178
Neuroscience Letters

Direct projections from the medial preoptic area to spinally-projecting neurons in Barrington's nucleus: an electron microscope study in the rat

https://doi.org/10.1016/S0304-3940(99)00562-5Get rights and content

Abstract

Direct projections from the medial preoptic area (MPO) to the pontine micturition center neurons directly projecting to the lumbosacral spinal cord were revealed electron microscopically in the rat by a double labeling method. Biotinylated dextran amine (BDA) was injected into the MPO and horseradish peroxidase (HRP) was injected into the lumbosacral cord segments. At light microscopic level, BDA-labeled presumptive axon terminals completely overlapped with HRP-labeled neurons in Barrington's nucleus. Electron microscopic observation showed that some BDA-labeled axon terminals made synaptic contacts with dendrites of HRP-labeled neurons in Barrington's nucleus. The present results indicated that the MPO may be involved in the modulation of the pontine micturition reflex in the rat.

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Acknowledgements

The authors thank Dr. Dian-Shi Wang for his critical reading of the manuscript. This work was supported, in part, by a grant from the National Natural Science Foundation of China (39600045).

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