The ultrastructure of the postcapillary venules(PCVs)of lymph nodes in 6 weeks old Pekin ducks was studied by electron microscopy. The venules are similar to those of the mammals,and exhibit certain structural features.

• 对6周龄北京鸭淋巴结毛细血管后微静脉的电镜观察证明，其基本结构与哺乳动物有相似之处，但也有显著差异。