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The top layer is called periosteum, which is a slippery thin tissue that covers the areas where tendons (the things that connect bone to muscle) and ligaments (the things that connect bone to bone).

Under that, there is a layer of compact bone, which is solid bone and very heavy.

Under the compact bone, there is spongy bone, which has little holes in it and looks somewhat like a sponge. This layer is not soft or squishy, even though you would expect it to be considering it's name. Spongy bone is lightweight, but serves the same purpose as compact bone, except is lighter and enables you to lift it.

In the larger bones, you would find bone marrow in the center of the bone. The red marrow manufactures blood cells, and the yellow marrow stores fat (the color of the marrow depends on it's location).

In smaller bones, instead of marrow, the bone would be filled with more spongy bone.

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14y ago

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