The compact bone is made up of a dense layer of calcium and minerals which makes it so hard that surgeons need a saw to cut through it. It is honeycombed with thousands of holes where nerves and blood vessels run, supplying it with oxygen and nutrients.
Compact bone is hard and dense and consists of microscopic cylindrical structures oriented parallel the long axis of the bone. This system is called the Haversian system. They are laid down in concentric rings called lamellae. These systems are interconnected to other systems in the bone to provide a network of blood vessels and nerves that are continuous.