脾脏是机体行使免疫功能的重要器官。为了探讨免疫与老化之间的关系,我们对脾脏的形态学进行了观察。实验用SD大鼠50只,按不同年龄分5组;3月龄组(青年)、8月龄组(壮年)、15月龄(初老)、20月龄及24月龄(老年),每组动物10只。取脾组织两块,一块置于中性福尔马林固定,常规石蜡包埋切片,作H.E染色及网状纤维 The spleen is an important organ for the body to exercise immune function. To investigate the relationship between immunity and aging, we observed the morphology of the spleen. 50 SD rats were used for experiment, divided into 5 groups according to different ages; 3 months old group (young), 8 months old group (strong), 15 months old (old age), 20 months old and 24 months old (old age), each Group of 10 animals. Two spleen tissues were removed and one piece was placed in neutral formalin fixed paraffin-embedded sections for H.E staining and reticular fiber