Compact bone lamellae. False-colour scanning electron micrograph of bony lamellae. They are found in the compact bone and are made of compacted collagen fibres and ground substances. The cells responsible for their production are known as osteoblasts. During bone formation osteoblasts lay down a bone matrix in a lamellar, sheet-like form which is subsequently mineralised by the formation of calcium phosphate crystals. Most lamellae are concentrically arranged around pre-existing blood vessels forming the so called Haversian systems or osteons. Magnification: x1060 at 6x7cm size. Magnification: x1700 at 4x5 inch size.