h 上浒充通大学 后 Shanghai Jiao Tong University Structural changes associated with LTP in the hippocampus (B)The dendrites of a CA1 pyramidal neuron were visualized by filling the cell with a fluorescent dye. (C)New dendritic spines(white arrows) can be observed to appear approximately 1 hour after a stimulus that induces LTP.The presence of novel spines raises the possibility that LTP may arise,in part,from formation of new synapses.(A after Squire and Kandel, 50 1999;B and C after Engert and Bonhoeffer,1999.) 海马神经元突触可塑性表现：一个小时刺 激引起长时程增强，新树突长出（白箭头 指出部分)。Shanghai Jiao Tong University 海马神经元突触可塑性表现：一个小时刺 激引起长时程增强，新树突长出（白箭头 指出部分）