The bone marrow is red jelly like mass of cellular tissue present in all the bones at birth this red bone marrow is slowly converted into yellow adipose tissue in most of the bones however it remains permanently red at any age in the ribs sternum and vertebrae yellow marrow fills the medullary cavities of the long bones in adults
There are many functions of the bone marrow which can be summarised as follows
1. it forms haemoglobin and red blood corpuscles
2. bone marrow is rich in reticulo endothelial cells which help in carrying out various function specially protecting the body against microbial infections and foreign bodies
3. it helps in the development of final thrombocytes from megakaryocytes
4. it forms granulocyte types of the white blood cells
5. it destroys old red blood corpuscles with the help of reticuloendothelial cells
primarily some bones develop from cartilage and some from membrane there are growth centres in bones namely epiphysis diaphysis and metaphysis after a particular age they ossify and then the bone does not grow further that is why man does not grow taller after youth these centres are means to identify age of a person before the age of 25 years
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