human_reference_atlas Homo sapiens organ part marginal zone of spleen http://upload.wikimedia.org/wikipedia/commons/1/15/Gray1191.png NCIT:C49767 marginal zone uberon UMLS:C1711368 Superficial Zone UBERON:0001251 AS junctional zone of spleen superficial zone EMAPA:36650 CALOHA:TS-2395 The zone between the red and white pulp of the spleen containing numerous macrophages and lymphocytes, and a rich plexus of sinusoids supplied by white pulp arterioles carrying blood-borne antigens. MA:0000755 FMA:15852 WP says - (Some sources consider it to be the part of red pulp which borders on the white pulp, while other sources consider it to be neither red pulp nor white pulp.) - we use the adjacency relation here so it overlaps neither. FMA considers this an anatomical line. spleen marginal zone Wikipedia:Marginal_zone red pulp-white pulp border