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Distribution of Fos-like immunoreactivity in the caudal medullary reticular formation following noxious facial stimulation in the rat

✍ Scribed by Yoko Mineta; Elon Eisenberg; Andrew M. Strassman

Publisher: Springer-Verlag
Year: 1995
Tongue: English
Weight: 630 KB
Volume: 107
Category: Article
ISSN: 0014-4819
DOI: 10.1007/bf00228014

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✦ Synopsis

To investigate the topographic organization of nociceptive neurons in the caudal medullary reticular formation, the distribution of cells that exhibit c-fos expression was examined following a unilateral noxious facial stimulus: subcutaneous injection of formalin into the vibrissal pad of awake rats. Labelling for Fos-like immunoreactivity was present in a somatotopic distribution in a region of the lateral reticular formation adjacent to trigeminal nucleus caudalis, which corresponds approximately to lamina V of the medullary dorsal horn. Labelling in adjacent regions of the reticular formation showed no somatotopy but was predominantly ipsilateral. Contralateral labelling was concentrated ventrolaterally around the lateral reticular nucleus and dorsally near the nucleus of the solitary tract.

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