Medial Hypothalamus
Mostrando 1-12 de 74 artigos, teses e dissertações.
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1. Effects of electroacupuncture on stress and anxiety-related responses in rats
ABSTRACT The aim of this work was to investigate if eletroacupuncture at PC6 would modulate the stress-induced anxiety-like behavior and the level of activation of several brain areas. Rats were distributed in groups: control; submitted to immobilization; submitted to immobilization and eletroacupuncture at PC6 or at the tail. Immobilization increased groomi
An. Acad. Bras. Ciênc.. Publicado em: 22/05/2017
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2. Envolvimento de mecanismos glutamatérgicos da substância cinzenta periaquedutal dorsal e do hipotálamo medial no medo condicionado à luz / Involvement of glutamatergic mechanisms of the dorsal periaqueductal gray matter and medial hypothalamus in conditioned fear to the light
A substância cinzenta periaquedutal dorsal (dPAG) e o hipotálamo medial (MH) são duas estruturas encefálicas que estão envolvidas na elaboração de estados aversivos e expressão de respostas defensivas. A estimulação elétrica da dPAG ou do MH produz uma série de respostas comportamentais que se assemelham às respostas defensivas induzidas pela pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/09/2012
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3. Mapeamento anátomo-funcional dos sítios neurais envolvidos nas respostas observadas durante exposição ao ambiente contextual de uma derrota social. / Anatomic and functional mapping of the neural sites involved in the observed responses during the exposition of the environment of a social defeat.
We investigated the neural systems involved in the contextual defense to a social defeat. We established a protocol to observe contextual defensive responses in animals previously defeated by an aggressive conspecific: animals were kept ten days living in a apparatus composed by two cages (room and resident cages). On the 11th day animals were exposed to an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/08/2012
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4. Involvement of NK-1 receptors of the basolateral and central nuclei of the amygdala in the defensive behavior of rats / Participação dos receptores NK-1 dos núcleos basolateral e central da amígdala no comportamento defensivo de ratos
A substantial body of evidence obtained in the last decade demonstrated that the Substance P (SP) is an important mediator of the affective and emotional behaviors. SP is a pro-aversive compound when microinjected within the dorsal periaqueductal gray (dPAG). These effects are mediated by the type 1 neurokininergic receptors (NK-1), since the defensive behav
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2012
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5. Panic-like defensive behavior but not fear-induced antinociception is differently organized by dorsomedial and posterior hypothalamic nuclei of Rattus norvegicus (Rodentia, Muridae)
The hypothalamus is a forebrain structure critically involved in the organization of defensive responses to aversive stimuli. Gamma-aminobutyric acid (GABA)ergic dysfunction in dorsomedial and posterior hypothalamic nuclei is implicated in the origin of panic-like defensive behavior, as well as in pain modulation. The present study was conducted to test the
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-04
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6. Gabaergic mechanisms of anterior and ventromedial hypothalamic nuclei in the expression of freezing in response to a light-conditioned stimulus
The amygdala, dorsal periaqueductal gray (dPAG), and medial hypothalamus have long been recognized to comprise a neural system responsible for the generation and elaboration of unconditioned fear in the brain. This neural substrate is well known to be under tonic inhibitory control exerted by γ-aminobutyric acid (GABA) mechanisms. Some evidence also suggest
Psychology & Neuroscience. Publicado em: 2011
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7. Effects of reversible inactivation of the dorsomedial hypothalamus on panic- and anxiety-related responses in rats
The medial hypothalamus is part of a neurobiological substrate controlling defensive behavior. It has been shown that a hypothalamic nucleus, the dorsomedial hypothalamus (DMH), is involved in the regulation of escape, a defensive behavior related to panic attacks. The role played by the DMH in the organization of conditioned fear responses, however, is less
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-09
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8. Hormonal and cognitive factors associated with the exploratory behavior of rats submitted to repeated sessions of the elevated plus-maze
Naive rats submitted to the elevated plus-maze (EPM) display a characteristic increase in open arm exploration and reduced risk assessment behaviors (RABs) after the administration of anxiolytic drugs. Upon re-exposure to the maze, however, the traditional measures of the EPM become resistant to these drugs. This intriguing phenomenon was initially observed
Psychology & Neuroscience. Publicado em: 2010-06
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9. Effects of inhibition of the hypothalamic dorsomedial reveersível and dorsal portion of the ventromedial hypothalamus on behavioral responses of defense. / Efeitos da inibição reversível do hipotalamo dorsomedial e da porção dorsal do hipotálamo ventromedial sobre respostas comportamentais de defesa.
O hipotálamo é uma estrutura de fundamental importância para a adaptação do organismo a situações de estresse, seja ele provocado por estímulos aversivosou por qualquer situação que altere o equilíbrio homeostático. Os núcleoshipotalâmicos mediais têm sido propostos como relacionados à modulação de respostas comportamentais de defesa e das
Publicado em: 2010
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10. Involvement of GABAergic mechanisms of the dorsal periaqueductal gray and inferior colliculus on unconditioned fear
The fact that the dorsal periaqueductal gray (dPAG) and inferior colliculus (IC), together with superior colliculus, medial hypothalamus and amygdala, constitute the brain aversion system has been well-established. Stepwise increases in the intensity of electrical stimulation of dPAG or IC cause freezing and escape responses, which are followed by a freezing
Psychology & Neuroscience. Publicado em: 2009-06
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11. Efeitos da administração de melatonina sobre o metabolismo energetico e fosforilação de proteinas sinalizadoras no hipotalamo de ratos neonatos / Effects of melatonin administration on energy metabolism and protein phosphorylation in the hypothalamus of neonatal rats
A melatonina (MLT) é um neurohormônio presente em humanos e outros vertebrados, sendo a glândula pineal principal fonte produtora. Além de sua conhecida ação cronobiológica, a MLT tem papel regulador sobre o metabolismo energético e sobre a massa corporal de mamíferos. A presença de receptores para MLT nos núcleos hipotalâmicos dorso-medial, supr
Publicado em: 2009
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12. Imprinting estrogenico : efeito sobre a expressão do receptor de androgeno no hipotalamo de ratos Wistar / Effects of estrogenic imprinting on the androgen receptor expression in the hypothalamus of Wistar rats
In male rats, complete reproductive function is critically dependent on adequate estrogen action at different levels of the hypothalamic-pituitary-gonadal axis. The administration of high doses during the period of sexual differentiation results in irreversible alterati ns in the male reproductive system. In brief, the estrogens have anti-androgenic effects
Publicado em: 2008