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Electrophysiological evidence for an excitatory projection from ventromedial forebrain structures on to raphe spinal and reticulo spinal neurons in the rat


, : Electrophysiological evidence for an excitatory projection from ventromedial forebrain structures on to raphe spinal and reticulo spinal neurons in the rat. Brain Research 380(1): 162-166

Spinally projecting neurones in nucleus raphe magnus (NRM) and the adjacent reticular formation of the medulla were identified by their antidromic responses to electrical stimulation in the lumbosacral spinal cord. Identified raphe-spinal and reticulo-spinal neurones were then tested for the effects of electrical stimulation at sites in the ventromedial forebrain, including the anterior hypothalamus and preoptic area (AH/POA). The results of these experiments have demonstrated that a considerable proportion of raphe- and reticulo-spinal neurones receive an excitatory input from the AH/POA. It is suggested that activity in this descending pathway might contribute to the inhibitory effects of AH/POA stimulation on the nociceptor-evoked activities of spinal dorsal horn neurones.


Accession: 005349631

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Related references

Lumb, B.M.; Morrison, J.F., 1986: Electrophysiological evidence for an excitatory projection from ventromedial forebrain structures on to raphe- and reticulo-spinal neurones in the rat. Spinally projecting neurones in nucleus raphe magnus (NRM) and the adjacent reticular formation of the medulla were identified by their antidromic responses to electrical stimulation in the lumbosacral spinal cord. Identified raphe-spinal and reti...

Lumb B.M.; Morrison J.F.B., 1985: Effects of ventromedial forebrain stimulation on the activities of raphe and reticulo spinal neurons in the rat. Journal of Physiology (Cambridge) 365: 28P

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Rodriguez Veiga E.; Holmes C.; Jones B.E., 1990: Relationship of gaba neurons to reticulo spinal neurons and raphe spinal neurons in the medullary reticular formation. Society for Neuroscience Abstracts 16(1): 851

Willis W.D.; Gerhart K.D.; Willcockson W.S.; Yezierski R.P.; Wilcox T.K.; Cargill C.L., 1984: Primate raphe spinal neurons and reticulo spinal neurons effects of stimulation in peri aqueductal gray or caudal part of the ventral posterior lateral thalamic nucleus. Recordings were made from 132 raphe- and reticulospinal tract neurons in the medial part of the lower brain stem in 32 anesthetized monkeys [Macaca fascicularis]. Recordings sites were in the nucleus raphe magnus, the rostral nucleus raphe obscuru...

Mccreery D.; Hames E.G.; Bloedel J.R., 1977: Effects of reticulo spinal and raphe spinal projections on the responses of spino thalamic neurons to mechanical stimuli. Physiologist 20(4): 62

Keay, K.; Westby, G.W.M.; Frankland, P.; Dean, P.; Redgrave, P., 1990: Organization of the crossed tecto reticulo spinal projection in rat ii. electrophysiological evidence for separate output channels to the periabducens area and caudal medulla. The previous paper (Redgrave et al., Neuroscience 37, 571-584, 1990) presented anatomical evidence indicating there at least two largely segregated components of the crossed tecto-reticulo-spinal pathway which project to the periabducens and cauda...

Keay, K.; Westby, G.W.; Frankland, P.; Dean, P.; Redgrave, P., 1990: Organization of the crossed tecto-reticulo-spinal projection in rat--II. Electrophysiological evidence for separate output channels to the periabducens area and caudal medulla. The previous paper (Redgrave et al., Neuroscience 37, 571-584, 1990) presented anatomical evidence indicating there are at least two largely segregated components of the crossed tecto-reticulo-spinal pathway which project to the periabducens area...

Morris R.; Winkles P.A., 1985: Light microscopic and electron microscopic analysis of raphe spinal and reticulo spinal neurons in the rat brainstem. Neuroscience Letters (SUPPL 21): S8

Beart P.M.; Nicolopoulos L.S.; West D.C.; Headley P.M., 1988: An excitatory amino acid projection from ventromedial hypothalamus to periaqueductal gray in the rat autoradiographic and electrophysiological evidence. The projection from ventromedial hypothalamus (VMH) to periaqueductal gray (PAG) has been implicated in various physiological processes in the rat, but the neurotransmitter mediating the excitatory response in PAG has not been identified. This pat...