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Bones are made of a soft matrix which is then calcified with calcium hydroxyapatite, which gives it a rigid structure. The outermost layer is called the periosteum, and is a tough, fibrous layer to which ligaments and tendons attach. The next layer is the cortical bone, which is very rigid and hard. It provides the shape and structure of the bone. The next layer in is the cancellous bone layer, which is a bit softer, and provides space for vascular elements and marrow. The cancellous bone makes the bones lighter.

In humans, the cortical bone makes up about 80% of bone mass, while cancellous bone is about 20%.

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15y ago
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10y ago

It would not be very pretty, I can imagine. It would be a white ring of bone, along with the red meaty bone marrow filling inside it. It would be quite bloody to split one open. If it is still part of a human, it would be INCREDIBLY PAINFUL to have split open. Don't try this.

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16y ago

The innermost part of the bone is called bone marrow.

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12y ago

Marrow. That's the stuff that makes your blood. I'm sure over the years you have seen a cooked broken chicken leg. That mushy stuff in the midde is the marrow.

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15y ago

it looks spongy

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13y ago

bone marrow

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