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American Zoologist 1975 15(1):147-153; doi:10.1093/icb/15.1.147
© 1975 by The Society for Integrative and Comparative Biology
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Lymph Node Structure. An Ontogenetic Explanation for Divergence in Eutheria, Metatheria, and Prototheria

B. J. BRYANT
Pathology Institute, University of Bern, 3010 Bern, Switzerland, and the Radiobiology Laboratory, University of California Davis, California 95616

The development of the mesenteric lymph node was studied in the polyprotodont marsupial, Marmosa mitis. A primary mesenchymal radiation from the mesenteric arterial investment into the surrounding mesenteric lymph space yielded reticulum having lymphoid affinity. A secondary radiation yielded the supporting connective tissues, i.e., the node's hilum and trabeculae. This secondary radiation is limited to eutherian and metatherian mammals; its absence in prototheria explains both the absence of complex lymph nodes in these mammals and the singular follicles found in their lymph vessels. The mesenchymal source indicates that complex lymph nodes, like splenic follicles, derive from mesenchyme associated with portions of the arterial tree. The ensuing evolution from source mesenchyme to mature nodal configuration is described in a tentative histogenetic scheme.


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