The structures of cortex and medulla of thymus were clear in mice in normal group,there were a large number of lymphocytes in the cortex and small number of lymphocytes in the medulla.

• 病理观察结果，正常对照组小鼠胸腺组织皮、髓质结构清楚，皮质内有大量的淋巴细胞，髓质内存在少量淋巴细胞；