Periaqueductal Grey
Mostrando 1-12 de 20 artigos, teses e dissertações.
-
1. Tryptophan overloading activates brain regions involved with cognition, mood and anxiety
ABSTRACT Tryptophan is the only precursor of serotonin and mediates serotonergic activity in the brain. Previous studies have shown that the administration of tryptophan or tryptophan depletion significantly alters cognition, mood and anxiety. Nevertheless, the neurobiological alterations that follow these changes have not yet been fully investigated. The ai
An. Acad. Bras. Ciênc.. Publicado em: 16/02/2017
-
2. ROLE OF DORSAL AND VENTRAL HIPPOCAMPUS ON CONDITIONED AND UNCONDITIONED FEAR ELICITED BY DORSAL PERIAQUEDUCTAL GREY MATTER ELECTRICAL STIMULATION IN RATS / PARTICIPAÇÃO DO HIPOCAMPO DORSAL E VENTRAL NAS REAÇÕES DE DEFESA PRODUZIDAS PELO CONDICIONAMENTO CONTEXTUAL DE MEDO E PELA ESTIMULAÇÃO ELÉTRICA DA MATÉRIA CINZENTA PERIAQUEDUTAL DORSAL
This study investigates the role of the hippocampus in both unconditioned and conditioned defense behavior by examining the effects of pre-training electrolytic lesions to the dorsal and ventral hippocampus in male rats exposed to two types of threat stimuli: electrical stimulation of the DPAG and footshock. Our results indicate that ventral and dorsal lesio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
-
3. O bloqueio dos receptores 5-HT2 da substância cinzenta periaquedutal suprime o efeito ansiolítico resultante do antagonismo dos receptores 5-HT1A do núcleo mediano da rafe em camundongos / Blockade of 5-HT2 receptors in the periaqueductal grey matter (PAG) abolishes the anxiolytic-like effect of 5-HT1A receptor antagonism in the median raphé nucleus in mice. 2011.
Várias evidências apontam o envolvimento de neurônios serotoninérgicos do núcleo mediano da rafe (NMnR) na ansiedade. Sabe-se que o bloqueio dos autorreceptores somatodendríticos dos núcleos da rafe aumenta a taxa de disparo dos neurônios serotoninérgicos, promovendo a liberação de serotonina em sítios pós-sinápticos como amígdala, hipocampo e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
-
4. Avaliação do papel dos receptores 5-HT3 da substância cinzenta periaquedutal de camundongos submetidos ao labirinto em cruz elevado
A exposição de animais a situações aversivas, tais como o labirinto em cruz elevado (LCE), ativa vias serotoninérgicas com projeções para estruturas envolvidas no sistema de defesa tais como, amídala, septo, hipotálamo, hipocampo e substância cinzenta periaquedutal (SCP), produzindo alterações comportamentais que podem ser caracterizadas como ans
Publicado em: 2009
-
5. VerificaÃÃo dos efeitos de Imipramina, Paroxetina, Buspirona e Diazepam no labirinto em T elevado em ratos e camundongos / Verifying the effects of imiprimine, paroxetine, buspirone and diazepam on elevated T-maze in mice and rats
The disorders of anxiety use to have high levels of prevalence among population, with varying degrees of severity, eventually causing disability. Deakin &Graeff have conceived a theoretical model, relating distal defence, amygdala and generalized anxiety, on the one hand, and proximal defence, periaqueductal grey substance and panic, on the other. In this pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/08/2008
-
6. Comportamento maternal e o papel dos receptores opióides na substância cinzenta periaquedutal de ratas lactantes. / Maternal behavior and the role of opioid receptors on periaqueductal grey in female lactating rats.
A estimulação opioidérgica decorrente do tratamento com morfina em fêmeas reprodutoras gera efeitos moleculares e comportamentais tardios diferenciados de acordo com o estado fisiológico no momento do tratamento. Trabalhos prévios têm demonstrado um importante papel da substância cinzenta periaquedutal (PAG) neste fenômeno. Assim, investigou-se a ex
Publicado em: 2008
-
7. Morpho-quantitative analysis of nuclear inclusions in periaqueductal grey matter neurons in the cat.
The morpho-quantitative analysis carried out in the neuronal population of the periaqueductal grey matter of the cat has shown that nuclear inclusions are mainly of the filamentous type and that they are distributed predominantly in the external region, i.e. in the part of the periaqueductal grey matter situated furthest from the cerebral aqueduct, where 30%
-
8. Electrophysiological analysis of inhibitory synaptic mechanisms in the preoptic area of the rat.
1. Extracellular recordings were made from single neurones in the medial preoptic-anterior hypothalamus of rats anaesthetized with urethane or pentobarbitone 2. Stimulation of the arcuate--ventromedial area evoked inhibition in 76% of neurones; inhibition occurred as the initial response in 26% of neurones, followed orthodromic excitation in 26% and antidrom
-
9. A search for brain stem cell groups integrating the defence reaction in the rat.
The defence areas of the rat brain stem have been extensively explored using electrical and chemical stimulation in an attempt to locate the regions containing the perikarya of neurones which may initiate or integrate the visceral and behavioural components of the defence reaction. In rats anaesthetized with alphaxalone-alphadolone, a cannula electrode was u
-
10. Facilitation of the arterial baroreflex by the ventrolateral part of the midbrain periaqueductal grey matter in rats.
1. The effects of stimulation of the ventrolateral part of the midbrain periaqueductal grey matter (PAG) on the arterial baroreflex were investigated in urethane-chloralose anaesthetized and artificially ventilated rats. 2. Both electrical and chemical stimulation of the ventrolateral PAG provoked hypotension, vagal bradycardia and marked facilitation of bar
-
11. Opioid inhibition of rat periaqueductal grey neurones with identified projections to rostral ventromedial medulla in vitro.
1. Rat caudal periaqueductal grey (PAG) output neurones containing rhodamine microspheres, retrogradely transported from an injection site in the rostral ventromedial medulla (RVM), were visualized in brain slices and recorded from using whole-cell patch clamp techniques. 2. The specific GABAB receptor agonist baclofen (10 microM) produced an outward current
-
12. Neurotensin inhibition of GABAergic transmission via mGluR-induced endocannabinoid signalling in rat periaqueductal grey
Neurotensin modulates pain via its actions within descending analgesic pathways which include brain regions such as the midbrain periaqueductal grey (PAG). The aim of this study was to examine the cellular actions of neurotensin on PAG neurons. Whole cell patch clamp recordings were made from rat midbrain PAG slices in vitro to examine the postsynaptic effec
Blackwell Science Inc.