The bone marrow is the site of active hematopoiesis after birth with the center of blood formation,The Bone marrow is the spongy tissue inside some of your bones , such as your hip and thigh bones . It contains stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting. After the age of seven years, the marrow is replaced slowly by the yellow fatty marrow.by twenty years of age, active hematopoietic marrow is seen only in the sternum, ribs, clavicles, scapulae, vertebrae, cranial diploe, Flat bones of the pelvis & upper ends of the humerus & femur. Cell Composition of Normal Adult Bone marrow Cell Classification Percentage of total cells (%) Granulocytes Myeloblasts 0.1 - 3.5 % Pomyelocytes 05 - 5 % Mylocytes 5 - 23 % ...
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