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dian ci ji jia tu shi qian qu - xia qiu nao qian bu dui zhong nao qu ti gan jue dan wei de xiao ying
Pages: 1-9
Year: Issue:  1
Journal: Acta Physiologica Sinica

Keyword:  视前区-下丘脑前部电刺激单位放电抑制效应“痛”躯体感觉针刺镇痛视前区一下丘脑前部兴奋效应肠神经;
Abstract: Rabbits were operated with an initial dose of light chloralose-urethane anes-thesia,and then immobilized by Flaxedil.Extracellular recordings were madefrom medial reticular units of the midbrain by KCl—K_3Fe(CN)_6 filled micropi-pettes.Four types of somatosensory units can be identified according to theirdischarge pattern and threshold to peripheral nerve stimulation.They are highthreshold excitatory(HTE),high threshold inhibitory(HTI),low threshold exci-tatory(LTE)and low threshold inhibitory(LTI)units.The effects of tetanization of preoptic-anterior hypothalamic(PO-AH)areaon three types(HTE,HTI,LTI)of these units were studied.Among the 31HTE units 16 were responsive to PO-AH tetanization,9 of which showed an in-hibitory effect,that was sometimes quite prolonged.Other units showed excita-tory,or excitato-inhibitory effects.However,the basal discharges behaved some-what differently,among 31‘pain’units 18 were affected,in which 10 showedexcitatory effect;6 inhibitory;2 excitato-inhibitory.All of the 5 HTI units showed enhancement of inhibition on tetanization ofPO-AH.Of the 17 LTI units,6 showed inhibitory effect,5 excitatory;1 excitato-inhibi-tory,while the remaining units were unresponsive to PO-AH tetanization.Theabove-mentioned results showed a preponderance of inhibitory effects of PO-AH stimulation on the medial reticular units.The following points were discussed:(1)the‘pain’units in medial reticularformation of the midbrain;(2)the relation of PO-AH stimulation to analgesia andacupuncture analgesia;(3)the relation of PO-AH stimulation to modulation ofsensory transmission.
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