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收集１８例第１２～４０周人胎儿肠系膜淋巴结，用免疫组织化学技术，观察了Ｔ、Ｂ淋巴细胞的分布。结果显示：ｓＩｇＭ和Ｋａｐｐａ轻链阳性Ｂ细胞主要分布在淋巴结的皮质部。Ｔ细胞分布较广泛，除副皮质区和皮质浅层外，还大量集中在髓质部。第２９周后，淋巴结、Ｂ细胞在皮质部已形成初级淋巴小结，但无生发中心和浆细胞。淋巴结内的毛细血管后微静脉随胎龄的增长而增多，其意义可能与介导淋巴细胞进入淋巴结内Ｔ、Ｂ细胞的分布区有关。
18 cases of human mesenteric lymph nodes from the 12th to the 40th week were collected. The distribution of T and B lymphocytes were observed by immunohistochemistry. The results showed that: sIgM and Kappa light chain positive B cells are mainly located in the cortex of the lymph nodes. T cells are widely distributed, in addition to the cortex and the cortex, but also a large number of medulla. After the 29th week, lymph nodes, B cells in the cortex have formed primary lymph node, but no germinal centers and plasma cells. The post-capillary venules in the lymph nodes increase with the increase of gestational age, and its significance may be related to the distribution of T and B cells that mediate the entry of lymphocytes into lymph nodes.