part of part of Rodentia organ part periarterial lymphatic sheath inner periarterial lymphatic sheath of spleen 2026-05-26T00:00:00Z https://github.com/obophenotype/uberon/pull/3722 central PALS Inner/outer PALS subdivision is described in rat and mouse (Veerman & van Ewijk 1975, doi:10.1007/BF00225103). In adult human spleen the T-cell regions are discontinuous and lack rodent-type PALS architecture (van Krieken et al. 1985, doi:10.1111/j.1365-2559.1985.tb02841.x; Steiniger, Rüttinger & Barth 2003, doi:10.1177/002215540305100511); no inner/outer subdivision has been demonstrated in humans. inner PALS dragon-ai-agent inner periarterial lymphatic sheath UBERON:8930193 The central region of the periarterial lymphatic sheath of the spleen, immediately surrounding the central arteriole. It forms the thymus-dependent (T cell) area of the splenic white pulp, is largely devoid of reticulum cells, and contains interdigitating cells in close contact with T lymphocytes.