依据重新定义的区域可达性，本文在均质平原背景的假设条件下推导出了区域双核结构模式的形成机制及相应的参数条件。

In order to derive the regional dual-nuclei structure by the method of building mathematical model, this paper redefines regional accessibility and establishes the formula to calculate it.

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CT扫描显示，双侧大脑基底节区，尾状核、豆状核及丘脑内有对称性钙化灶。

CT scans revealed the bilateral and symmetric calcifications of the basal ganglia, caudate nucleus, lentiform nucleus and thalami.

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目的：损伤大鼠双侧基底核形成阿尔茨海默病(AD)模型，用空间参考记忆和空间工作记忆共同检测该模型的可靠性。

Objective: To explore the reliability of Alzheimer's disease, AD model in rats with spatial reference memory and spatial working memory.

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