Polarised light micrograph of human bone showing Haversian Canals (small dark areas). Human compact bone is composed of parallel columns made up of concentric bony layers (lamellae) organised around channels containing blood vessels, lymph vessels and nerves - the Haversian Canals. The bony columns are arranged in parallel to the axes of long bones. The central canals and their surrounding lamellae are known collectively as Haversian systems. Deposition of bone occurs concentrically from the periphery of the originally broad Haversian channel, with the bone lamellae being layed down by osteoblast cells. Magnification: X50 at 35mm, x100 at 5x7cm size.
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