Bones and Muscles | Hard and spongy
Hard and spongy
Almost every bone in the body is made of the same materials: The outside of the bone is the hard layer that is strong. It is made of living cells and is called compactThe outer, hard layer of the bone. or hard bone. Holes and channels run through the compact bone, carrying blood vessels and nerves to its inner parts. Inside this layer is cancellous boneAlso called spongy bone, the inner layer of a bone that has cells with large spaces in between them filled with marrow. or spongy bone. Cancellous bone has cells with large spaces in between them like a honeycomb. The spaces in this network are filled with a jellylike red-and-yellow bone marrowThe spongy center of many bones in which blood cells are manufactured.. Red bone marrow, found...
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