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Fluorescent double-label study of lateral reticular nucleus projections to the spinal cord and periaqueductal gray in the rat

✍ Scribed by Lee, H.S. ;Mihailoff, G.A.

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 601 KB
Volume: 256
Category: Article
ISSN: 0003-276X
DOI: 10.1002/(sici)1097-0185(19990901)256:1<91::aid-ar12>3.0.co;2-x

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✦ Synopsis

Following injections of WGA-HRP into either the spinal cord or periaqueductal gray, labeled neurons were 7observed bilaterally along the periphery of the lateral reticular nucleus (LRN) magnocellular division. The possibility that some of these neurons in the LRN provide collateral axonal branches to both the periaqueductal gray and the spinal cord was investigated in rats using a retrograde double-labeling method employing two different fluorescent tracers, True Blue and Nuclear Yellow. Following sequential injection of the two fluorescent axonal tracers into the spinal cord and periaqueductal gray in the same animal, a modest number of doublelabeled neurons were observed bilaterally near the medial and dorsal perimeter of the magnocellular division of the LRN. The labeled neurons were distinctly multipolar in shape and measured approximately 15-18 µ in their greatest transverse diameter. No double-labeled neurons were observed in the parvocellular or subtrigeminal divisions of the LRN. Based upon these observations, it is suggested that collaterals of the LRN-spinal pathway provide feedback information to the periaqueductal gray that might then be used to modulate the participation of the latter cell group in a variety of pain processing and cardiovascular regulatory functions. Anat Rec

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