存在于淋巴结和Ｐｅｙｅｒｓ板等淋巴组织的淋巴细胞 ,特别是其中的Ｔ细胞 ,不只是滞留在局部 ,而是能从淋巴组织中经淋巴管流出。随着淋巴管中的淋巴液循环 ,进入胸导管再回到静脉内。再随血液循环回到淋巴组织 ,通过毛细血管后静脉 ,即高内皮细胞细静脉(ｈｉｇｈｅｎｄｏｔｈ Lymphocytes, such as lymph nodes and peyers, lymphocytes, especially T cells in them, not only local, but can flow from the lymphatic tissue through the lymphatic vessels. As lymphatic vessels in the lymphatic circulation, enter the thoracic duct and return to the vein. Then with the blood circulation back to lymphoid tissue, through the capillary vein, that is, the high endothelial cells of the vein (highendoth