Next is a dense, rigid bone called the compact bone. It is shaped like a cylinder and is so hard that surgeons must use a saw to cut through it. It is honeycombed with thousands of tiny holes and passageways, through which run nerves and blood vessels that supply oxygen and nutrients to the bone. This dense layer supports the weight of the body and is made up of mostly calcium and minerals, so that it feels no pain. These three bone layers work together with nerve signals which speed back and forth and blood streams which move between the layers.
Thighbones are usually stronger, pound for pound, than reinforced concrete.
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