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Making the world better, one answer at a time. bone marrow is considered to part of the immune system because it was the key component of the lymphatic system, producing the lymphocytes that support the body's immune system.aking the world better, one answer at a time. bone marrow is considered to part of the immune system because it was the key component of the lymphatic system, producing the lymphocytes that support the body's immune system.
Bone marrow is also an important part of the lymphatic system. Bone marrow consists of stem cells, which are large, primitive, undifferentiated cells supported by fibrous tissue called stroma. There are 2 main types of stem cells and, therefore, the bone marrow consists of 2 types of cellular tissue.