Nociceptors
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. NERVE ENDINGS AND VASCULAR SUPPLY IN SEMITENDINOSUS TENDON OF CEREBRAL PALSY CHILDREN
Objective:To evaluate the distribution of SP (substance P) and S-100 peptide immunoreactivity, as well as the vascular supply of tissues commonly used as grafts for anterior cruciate ligament (ACL) reconstruction. A second aim was to compare the above mentioned distribution in the semitendinosus muscle tendons of cerebral palsy (CP) patients with the semiten
Acta ortop. bras.. Publicado em: 2015-10
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2. Interferência de nanopartículas magnéticas administradas na medula espinal na resposta comportamental a um estímulo mecânico / Interference of magnetic nanoparticles administered in spinal cord in a behavioral response to mechanical stimuli
Nanopartículas são estruturas com dimensões nanométricas que vem demonstrando um potencial para várias aplicações, inclusive na área biológica. De acordo com o seu processo de síntese e crescimento estas partículas podem possuir propriedades magnéticas com maior ou menor magnitude. O objetivo deste trabalho foi avaliar se a administração no esp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2011
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3. Avaliação do impacto da presença de dor miofascial (rdc/tmd) no limiar de dor à pressão (ldp) da musculatura mastigatória em mulheres portadoras de enxaqueca / Impact of myofascial pain (rdc/tmd) on pressure pain thershold of masticatory muscles in women with migraine
The objective of this study was to assess the impact of miofascial pain, according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD), on the pressure pain thershold (PPT) of masticatory muscles in women with migraine, during a migraine attack and in the absence of it. Moreover, the study compared depression scores, daytime clenchi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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4. Selective responsiveness of polymodal nociceptors of the rabbit ear to capsaicin, bradykinin and ultra-violet irradiation.
1. The activity of single C- and A-fibre cutaneous sensory units was recorded from the great auricular nerve of anaesthetized rabbits to compare the effects of chemical with other forms of stimulation under several experimental conditions. Chemical agents were delivered by close arterial injection. 2. Small intra-arterial injections of bradykinin (0.2 microg
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5. Nociceptors and warm receptors innervated by C fibres in human skin.
The properties of 125 C fibre units recorded from the peripheral nerves of conscious man were studied. On the basis of receptive field properties and responses to natural stimulation, 120 of the units were classified as polymodal C nociceptors. Five of the units were identified as specific C warm receptors. In contrast to the polymodal nociceptors, which oft
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6. Response of C fibre nociceptors in the anaesthetized monkey to heat stimuli: correlation with pain threshold in humans.
1. Ramped heat stimuli were used to compare the effects of rate of temperature change on the responses of monkey nociceptors and on heat pain threshold in human subjects. Recordings were made from twenty-five cutaneous C fibre mechano-heat nociceptors (CMHs) innervating the hairy skin in the anaesthetized monkey. Heat pain thresholds were determined on the v
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7. C-polymodal nociceptors activated by noxious low temperature in human skin.
1. Fifty-five C-polymodal nociceptors innervating hairy skin in human volunteers were tested for discrete stimulus-response properties through microneurography. 2. All fifty-five units were responsive to mechanical and heat stimuli. Twenty-two (40%) of these exhibited an additional response to noxious low temperature. The twenty-two mechano-heat-cold nocicep
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8. Bradykinin-induced modulation of the response behaviour of different types of feline group III and IV muscle receptors.
1. In order to test the hypothesis that bradykinin has a sensitizing action on muscle receptors (e.g. during a myositis), the response properties of single group III and IV afferent units from the cat gastrocnemius-soleus muscle were compared before and after infiltration of their receptive fields with a bradykinin solution. According to their responses to g
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9. Blockade by calcium antagonists of chemical excitation and sensitization of polymodal nociceptors in the cat's cornea.
1. The possibility that a modified Ca2+ channel mediates chemical and thermal excitation of nociceptors was examined in single polymodal nociceptive fibres of the cat's cornea. 2. Ca2+ channel blockers cadmium (2.5 mM) and diltiazem (1 mM), and high external [Ca2+] (40 mM), markedly reduced nociceptive responses to topical acidic solutions (pH 4.5). 3. Decre
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10. Relationship of substance P to afferent characteristics of dorsal root ganglion neurones in guinea-pig.
1. The relationship between the afferent properties and substance P-like immunoreactivity (SP-LI) of L6 and S1 dorsal root ganglion (DRG) neuronal somata was examined in anaesthetized guinea-pigs. Glass pipette microelectrodes filled with fluorescent dyes were used to make intracellular recordings and to label DRG somata. The dorsal root conduction velocity
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11. Hyperalgesic agents increase a tetrodotoxin-resistant Na+ current in nociceptors.
Sensitization of primary afferent neurons underlies much of the pain and tenderness associated with tissue injury and inflammation. The increase in excitability is caused by chemical agents released at the site of injury. Because recent studies suggest that an increase in voltage-gated Na+ currents may underlie increases in neuronal excitability associated w
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12. Excitation by irritant chemical substances of sensory afferent units in the cat's cornea.
1. Single-unit electrical activity was recorded from thin myelinated sensory nerve fibres innervating the cornea of deeply anaesthetized cats. 2. Based on their responses to mechanical (calibrated von Frey hairs), chemical (10 mM-acetic acid and/or 616 mM-NaCl) and thermal (ice-cold or heat up to 51 degrees C) stimuli, corneal A delta fibres were classified