Pervascular lymphoid nodules (PVLN) do not comprise of any microdistrict of mesentery hemolymph microvasculature (HLMV). Their quantity, sizes, forms, structure and topography are very variable. PVLN surround gathering venule and its tributaries. PVLN can be dissipated all around the microdistrict, not approaching the edge (main arteriola and venule) or concentrate boundaries (prenodules) or formed, are often specified around postcapillary venule. All listed lymphadenoids can be in one microdostrict - stages of PVLN morphogenesis when functional load increase and proper alteration of HLMV. PVLN is situated between terminal arteriola and gathering venule, and all together with their branches and tributaries compose a complex, "immune" module of HLMV. PVLN may function as counterflow system: antigens come through interstitially channels or lymph capillary with endothelial walls without basal membrane and lymphocytes from postcapillary venule. Inflow of their great quantity in these venules with antigen stimulation may be through arteriola-venule anastomosis, by-passing capillary net with stenopaic. Increase of blood inflow to forming PVLN brings to local growth and magistralization of HLMV.
The work is presented for an International Science Conference "Fundamental and applied researches in medicine", France (Paris), October 13-20, 2009. Received by the editorship on 11.08.2009.
