The term myeloid (myelogenous) is an adjective that can refer to a progenitor cell for granulocytes, monocytes, erythrocytes, or platelets. Myeloid can be distinguished from the lymphoid progenitor cells that give rise to B cells and T cells.Myleloid is thus associated with the innate immune system, in contrast to lymphoid, which is associated with the adaptive immune system.yeloid cells originate in bone marrow or spinal cord, or a resemblance to the marrow or spinal cord.