Elsevier

Neuroscience Letters

Volume 80, Issue 1, 11 September 1987, Pages 33-38
Neuroscience Letters

The relationship of terminals containing neuropeptide Y-like immunoreactivity to lumbar sympathetic vasoconstrictor neurones in the rabbit

https://doi.org/10.1016/0304-3940(87)90490-3Get rights and content

Abstract

The distributions of preganglionic neurones retrogradely labelled with horseradish peroxidase and of immunohistochemically identified varicose axons reactive for neuropeptide Y (NPY-IR) in the intermediate zone of rabbit lumbar spinal segments have been compared. Neurones projecting in the caudal lumbar sympathetic chain (LSC), which are mainly vasoconstrictor, were located laterally, associated with dense accumulations of NPY-IR terminals in mid L3 to caudal L4. In all other regions of the lumbar intermediate zone, there was relatively little correlation between the location of either LSC neurones, or those projecting to the pelvic viscera, and aggregations of NPY-IR axons. Most of these axons probably arise in the C1 nucleus, but it seems possible that this nucleus innervates only some groups of lumbar vasoconstrictor neurones.

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Present address: School of Physiology and Pharmacology, University of New South Wales, P.O. Box 1, Kensington. N.S.W. 2033, Australia.

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