[Differences in the structure of the posterior parietal (lumbar) lymphatic bed of the peritoneal cavity in human fetuses and newborns].

The study was performed in 150 corpses of human 8.5-36 wks old fetuses and 10 newborns using the complex of macro-microscopic methods. Primary lymphatic structures of lumbar region (sacs and canals) are transformed into lymphatic plexuses (9.5-10.5 wks) with the following formation of anlages of lumbar lymph nodes inside the invaginations. Variants of lumbar tracts and trunks structure arise during magistralization of lymphatic plexuses (14.5-19.5 wks) and reflect its depth and topographic variant. In intensive, medium and weak magistralization monomagistral, intermediate and plexiform forms develop. Topographic variant of magistralization provides the appearance of right-sided (20%), left-sided (20%) and relatively even bilateral (60% cases) organization of lumbar lymphatic bed on the whole.