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脑诱发电位活动的起源与形成关于脑诱发电位的起源与形成存在若干理论。王纪佐等曾作过研究,归纳为四个方面。神经元电位学说脑诱发电位的主要神经电位有两种:即动作电位(神经冲动的传导)和突触后电位(突触传递过程中产生的)。而神经元本身固有的电活动——膜电位这里不再作介绍。1.动作电位:神经元在兴奋时伴有电位变化。细胞膜对离子的通透性发生改变,主要是细胞膜对Na~+的通透性选择性地突然增高,对 K~+的通秀性虽然也增高,但比 Na~+延后和缓慢。因而细胞兴奋时,Na~+很快从细胞外向细胞内扩散,使膜内正离子迅速增加,并抵消了原有的膜电位(休止电位),最后甚至造成细胞内的电位高于细胞外,即膜的极化逆转;这
The Origin and Formation of Brain Evoked Potential Activity There are several theories about the origin and formation of brain evoked potential. Wang Jizuo et al had made research, summarized in four aspects. Theory of neuron potential Brain evoked potential of the main nerve potential there are two: the action potential (nerve impulse conduction) and postsynaptic potential (generated during synaptic transmission). The intrinsic electrical activity of the neurons - membrane potential is no longer introduced here. 1. Action potentials: neurons in the excited accompanied by potential changes. The permeability of cell membrane changed to ion, which was mainly that cell membrane selectively and suddenly increased permeability of Na ~ +. Although the permeability to K ~ + also increased, it was delayed and slower than Na ~ +. Thus, when the cells are excited, Na ~ + diffuses rapidly from the extracellular to the intracellular and the positive ions in the membrane rapidly increase and offset the original membrane potential (resting potential), finally, the intracellular potential is even higher than the extracellular, That is, the polarization of the membrane is reversed;