part_of part of is part of part of has part has part has_part marrow fibroblast Homo sapiens yellow bone marrow bone marrow stroma sinusoid mesoderm-derived structure stroma of bone marrow CALOHA:TS-0085 bone marrow stroma UBERON:0007195 The stroma of the bone marrow is all tissue not directly involved in the primary function of hematopoiesis. The yellow bone marrow belongs here, and makes the majority of the bone marrow stroma, in addition to stromal cells located in the red bone marrow. Yellow bone marrow is found in the Medullary cavity. Still, the stroma is indirectly involved in hematopoiesis, since it provides the hematopoietic microenvironment that facilitates hematopoiesis by the parenchymal cells. For instance, they generate colony stimulating factors, affecting hematopoiesis. uberon FMA:21426