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How does blood reach the marrow?


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This is probably a stupid question but…

 

How exactly do oxygen and nutrients reach the bone marrow?

 

I asked in the forum and someone gave me this:

http://en.wikipedia.org/wiki/File:Illu_compact_spongy_bone.jpg

 

But that still leaves the fact that some part of the circulatory system; some vain and artery, would have to go through the bone and supply blood to the marrow.

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This is probably a stupid question but…

 

How exactly do oxygen and nutrients reach the bone marrow?

 

I asked in the forum and someone gave me this:

http://en.wikipedia.org/wiki/File:Illu_compact_spongy_bone.jpg

 

But that still leaves the fact that some part of the circulatory system; some vain and artery, would have to go through the bone and supply blood to the marrow.

They do. If you look at long bones (e.g. humorus, femur, etc.), towards the ends, you can see the holes where perforating vessels pass from the periosteum into the bone.

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