part of part of bone element bone marrow AAO:0011007 BTO:0000141 BTO:0000829 CALOHA:TS-0087 EFO:0000868 EMAPA:32760 EV:0100046 FMA:9608 GAID:1287 In adults, marrow in large bones produces new blood cells[Wikipedia:Bone_marrow] MA:0000134 MAT:0000084 MESH:D001853 MIAA:0000084 OpenCyc:Mx4rvVm-FpwpEbGdrcN5Y29ycA TODO - create superclass for bone marrow / head kidney. both are portions of tissue in the hematopoetic system. also consider adding as subclass of zone of bone organ for consistency with FMA. See also: Leydig and epigonal organs The bone marrow is the hematopoietic organ in all vertebrates but fishes, in which hematopoiesis occurs in the kidney.[well established][VHOG] UBERON:0002371 UMLS:C0005953 VHOG:0001218 XAO:0000123 galen:BoneMarrow medulla of bone medulla ossea medulla ossium the soft tissue that fills the cavities of bones uberon hematopoietic system immune system hemopoietic tissue