Stacks of parallel or concentrically stacked sheets arranged as rods, plates, and arches. In vertebrae, it forms flat bones and forms the hematopoeitic center of epiphyses of long bones. It contains no Haversian systems. | Stacks of parallel or concentrically stacked sheets arranged as rods, plates, and arches. In vertebrae, it forms flat bones and forms the hematopoeitic center of epiphyses of long bones. It contains no Haversian systems. |