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依据细胞大小、形态和密度的不同，把中央杏仁核分为５个亚区：即内侧亚区（ＣＭ）、腹侧亚区（ＣＶ）、中间亚区（ＣＩ）、外侧亚区（ＣＬ）和外侧囊亚区（ＣＬＣ）。ＣＬ体积最大（０．１０３ｍｍ３），细胞总数最多（８７１１个），细胞中等大小，细胞密度最高（８．６４ｘ１０４个／ｍｍ３）；ＣＩ体积最小（０．０１６ｍｍ３）、细胞总数最少（１０７５个），但细胞最大；ＣＬＣ细胞密度最低（４．５４×１０４个／ｍｍ３），细胞也最小；ＣＭ和ＣＶ的各项参数介于上述最高和最低参数之间。将ＨＲＰ注入一侧迷走背核复合体的上部后，在同侧中央杏仁核各亚区内标记细胞的平均数及与其神经元总数的百分比为：ＣＭ：３７２１个，７０％；ＣＶ：１４１２个，３５％；ＣＩ：８３个，８％；ＣＬ：３９１个，５％。ＨＲＰ注射入闩下部后，数据为：ＣＭ：１８２２个，３４％；ＣＶ：６０６个，１５％；ＣＩ：６８个，６％；ＣＬ：２９５个，３％。本研究表明：向迷走背核复合体直接投射的神经元是中央杏仁核内较小的细胞。投射的主要亚区为ＣＭ和ＣＶ，两亚区向闩上部的纤维投射明显多于向闩下部的投射。
According to the cell size, morphology and density, the central amygdala is divided into five subregions: the medial subregion (CM), the ventral subregion (CV), the middle subregion (CI), the lateral subregion (CL) And lateral subcapsular zone (CLC). The largest volume of CL (0.103mm3), the largest number of cells (8711), the middle size of cells, the highest cell density (8.64x104 cells / mm3), the smallest volume of CI (0.016mm3) But the largest cell; CLC cell density lowest (4.54 × 104 cells / mm3), the smallest cells; CM and CV parameters between the highest and lowest parameters. After injecting HRP into the upper part of the dorsal vagal complex, the average number of labeled cells and the percentage of labeled neurons in the ipsilateral central amygdala were: 3721, 70%; CV: 1412 , 35%; CI: 83, 8%; CL: 391, 5%. HRP was injected into the lower part of the bar after the data were: CM: 1822, 34%; CV: 606, 15%; CI: 68, 6%; CL: 295, 3%. This study shows that the neurons directly implanted into the vagal complex of the vagus are smaller cells in the central amygdala. The major sub-regions projected are CM and CV, and the projection of fiber to the upper part of the bolt in the two sub-regions is significantly more than the projection to the lower part of the bolt.