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• W1771301420 endingPage "112" @default.
• W1771301420 startingPage "103" @default.
• W1771301420 abstract "Pain has a strong emotional dimension, and the amygdala plays a key role in emotionality. The processing of nociceptive mechanical and thermal information was studied in individual neurons of the central nucleus of the amygdala, the target of the spino-parabrachio-amygdaloid pain pathway and a major output nucleus of the amygdala. This study is the first to characterize nociceptive amygdala neurons with input from deep tissue, particularly the knee joint. In 46 anesthetized rats, extracellular single-unit recordings were made from 119 central amygdala neurons that were activated orthodromically by electrical stimulation in the lateral pontine parabrachial area and were tested for receptive fields in the knee joints. Responses to brief mechanical stimulation of joints, muscles, and skin and to cutaneous thermal stimuli were recorded. Receptive-field sizes and thresholds were mapped and stimulus-response functions constructed. Neurons in the central nucleus of the amygdala with excitatory input from the knee joint (n = 62) typically had large symmetrical receptive fields in both hindlimbs or in all four extremities and responded exclusively or preferentially to noxious mechanical stimulation of deep tissue (n = 58). Noxious mechanical stimulation of the skin excited 30 of these neurons; noxious heat activated 21 neurons. Stimulus-response data were best fitted by a sigmoid nonlinear regression model rather than by a monotonically increasing linear function. Another 15 neurons were inhibited by noxious mechanical stimulation of the knee joint and other deep tissue. Fifteen neurons had no receptive field in the knee but responded to noxious stimulation of other body areas; 27 nonresponsive neurons were not activated by natural somesthetic stimulation. Our data suggest that excitation is the predominant effect of brief painful stimulation of somatic tissue on the population of central amygdala neurons with knee joint input. Their large symmetrical receptive fields and sigmoid rather than monotonically increasing linear stimulus-response functions suggest a role of nociceptive central amygdala neurons in other than sensory-discriminative aspects of pain." @default.
• W1771301420 created "2016-06-24" @default.
• W1771301420 creator A5032062559 @default.
• W1771301420 creator A5054742181 @default.
• W1771301420 date "2002-01-01" @default.
• W1771301420 modified "2023-09-24" @default.
• W1771301420 title "Processing of Nociceptive Mechanical and Thermal Information in Central Amygdala Neurons With Knee-Joint Input" @default.
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• W1771301420 doi "https://doi.org/10.1152/jn.00264.2001" @default.
• W1771301420 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11784733" @default.
• W1771301420 hasPublicationYear "2002" @default.
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