1. Occurs in shaft of long bones.
Occurs in skull bones, vertebrates, ribs and epiphysis of long bones.
2. Regular Haversian system is present
Regular Haversian system is absent.
3. Marrow cavity is present
Marrow cavity is absent
4. Yellow bone marrow is found
Red bone marrow is found
5. Marrow stores fats.
Marrow forms RBCs and granular WBCs.