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应用Nissl法和Golgi法研究了正常成年SD大鼠的海马神经元构筑。发现：大鼠海马内有大锥体细胞、大梭形细胞、小锥体细胞、小梭形细胞及异位颗粒细胞等5种类型的神经元。神经元的类型及分布在海马各区之间差异较明显。海马神经元的胞体主要聚集于锥体层。各区神经元脑体分布的厚度及密度分别为CA1：（281．5±65.5）μm，（258．1±89．3）个／mm；CA2：（46．6±11．5）μm，（251．0±647）个／mm；CA3：（61．7±16．6）μm，（201．6±40．5）个／mm；CA4：（90．6±28．6）μm，（196.0±37．3）个／mm。
The hippocampal neurons of normal adult SD rats were studied by Nissl method and Golgi method. It is found that there are five types of neurons in rat hippocampus including large pyramidal cells, large spindle cells, small pyramidal cells, small spindle cells and ectopic granulosa cells. The type and distribution of neurons in the hippocampus between the more obvious differences. The hippocampal neuron cell body mainly in the pyramidal layer. The thickness and density of neurons in each area were CA1: (281.5 ± 65.5) μm, (258.1 ± 89.3) / mm; CA2: (46.6 ± 11.5) μm, 251.0 ± 647) / mm; CA3:(61.7 ± 16.6) μm, (120.6 ± 40.5) / mm; CA4: (90.6 ± 28.6) μm, 196.0 ± 37.3) pieces / mm.