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Brain afferents to the medullary dorsal reticular nucleus: a retrograde and anterograde tracing study in the rat
Author(s) -
Almeida Armando,
Cobos Angeles,
Tavares Isaura,
Lima Deolinda
Publication year - 2002
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.1460-9568.2002.02058.x
Subject(s) - parabrachial nucleus , neuroscience , parvocellular cell , spinal trigeminal nucleus , reticular formation , anterograde tracing , solitary tract , anatomy , stria terminalis , brainstem , substantia innominata , lateral reticular nucleus , nucleus , dorsal motor nucleus , periaqueductal gray , medulla oblongata , tegmentum , chemistry , nociception , midbrain , biology , central nervous system , vagus nerve , biochemistry , basal forebrain , receptor , stimulation
The medullary dorsal reticular nucleus (DRt) was recently shown to belong to the supraspinal pain control system; neurons within this nucleus give origin to a descending projection that increases spinal nociceptive transmission and facilitates pain perception [Almeida et al. (1999), Eur. J. Neurosci. , 11 , 110–122]. In the present study, the areas of the brain that may modulate the activity of DRt neurons were investigated by using of tract‐tracing techniques. Injection of a retrograde tracer into the DRt resulted in labelling in multiple areas of the brain. In the contralateral orbital, prelimbic, infralimbic, insular, motor and somatosensory cortices labelling was prominent, but a smaller ipsilateral projection from these same areas was also detected. Strong labelling was also noted in the central amygdaloid nucleus, bed nucleus of stria terminalis and substantia innominata. Labelled diencephalic areas were mainly confined to the hypothalamus, namely its lateral and posterior areas as well as the paraventricular nucleus. In the mesencephalon, the periaqueductal grey, red nucleus and deep mesencephalic nucleus were strongly labelled, whereas, in the brainstem, the parabrachial nuclei, rostroventromedial medulla, nucleus tractus solitarius, spinal trigeminal nucleus, and the parvocellular, dorsal, lateral and ventral reticular nuclei were the most densely labelled regions. All deep cerebellar nuclei were labelled bilaterally. These data suggest that the DRt integrates information from the somatosensory, antinociceptive, autonomic, limbic, pyramidal and extrapyramidal systems while triggering its descending facilitating action upon the spinal nociceptive transmission.