MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Polarised light micrograph of normal human bone tissue. The rings, visible in the area on the left, correspond to concentric bands of calcified material called lamellae. They are centered around an Haversian canal, a channel for the nerves and blood & lymph vessels which runs the entire length of the bone. Each of the small dark spots is a lacuna, a hole in the bone which is occupied by an osteocyte or bone cell. The active form of the osteocyte is the osteoblast cell, responsible for bone formation. Each canal and surrounding lamellae comprise an Haversian system. Magnification: x50 at 6x7cm size.
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