目的：分析高原低氧环境对大鼠大脑皮质、海马神经颗粒素表达的影响以及与学习记忆的关系。

AIM: To analyze the influence of high-altitude hypoxia on the expression of cerebral cortex, hippocampus neurogranin in rats in relation to learning and memory abilities.

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结果：在老年组，神经元固缩、核糖体解聚、胞浆内出现大量脂滴及脂褐素颗粒、染色质凝聚。

Results: For the neuron, we can find pyknosis of neuron, depolymerization of ribosome, accumulation of lipid droplets and lipofuscin, condensation of chromatin.

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