Cancellous bone, or spongy bone, has many open spaces and contains marrow. It is softer and weaker than compact bone.
Infants grow relatively fast and need quite a lot of red blood cells, which are only produced in red bone marrow. As the infants grow older, much of the red bone marrow is gradually replaced by yellow bone marrow containing a special kind of fat that gives it its yellowish color. If the body needs more red blood cells than the remaining red marrow is capable of producing, some of the yellow marrow changes to red marrow.
There are 2 types of bone tissue: Spongy or cancellous bone (head of most large bones, ribs, shoulder blade) and Compact (in the diaphysis or middle part of large bones). Compact bone forms the extremely hard exterior while spongy bone (also called cancellous bone) fills the hollow interior. Within the inside of the long bones is bone marrow.
Bone marrow. Bone marrow is where blood cells are created. Only long bones (with the "hole" in the center) have bone marrow in them. So leg bones and arm bones make blood cells, but rib bones or skull bones do not. So those short, solid, irregular-shaped bones do not create blood cells.
The kind of marrow that produces red blood cells, white blood cells, and platelets is red marrow which is found in the bones.
The part of bone you are asking about is called compact bone, or cortical bone.
a marrow
There is yellow bone marrow and red bone marrow.
red marrow
All bone marrow transplants require bone marrow from a donor; the purpose of the transplant is to replace the patient's bone marrow (that no longer works) with some that does work, which clearly cannot come from the patient (since they have none that works). Hence a donor must be used.
Infants grow relatively fast and need quite a lot of red blood cells, which are only produced in red bone marrow. As the infants grow older, much of the red bone marrow is gradually replaced by yellow bone marrow containing a special kind of fat that gives it its yellowish color. If the body needs more red blood cells than the remaining red marrow is capable of producing, some of the yellow marrow changes to red marrow.
There are 2 types of bone tissue: Spongy or cancellous bone (head of most large bones, ribs, shoulder blade) and Compact (in the diaphysis or middle part of large bones). Compact bone forms the extremely hard exterior while spongy bone (also called cancellous bone) fills the hollow interior. Within the inside of the long bones is bone marrow.
spongy bone
Bone marrow. Bone marrow is where blood cells are created. Only long bones (with the "hole" in the center) have bone marrow in them. So leg bones and arm bones make blood cells, but rib bones or skull bones do not. So those short, solid, irregular-shaped bones do not create blood cells.
Flat bones in adult and almost all bones in children
Leukemia is a general description of any cancer of the blood and bone marrow.
Illnesses where the body has trouble making new blood cells
The kind of marrow that produces red blood cells, white blood cells, and platelets is red marrow which is found in the bones.