ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Cancellous bone. Light micrograph of a section through cancellous (spongy) bone from the humerus (upper arm bone). Cancellous bone is found in a bone's interior. It is characterised by a honeycomb arrangement, comprising a network of trabeculae (red) fibrous tissue. The trabeculae are composed of irregular lamellae of bone and lacunae (cavities) containing osteocytes (purple). Osteocytes are osteoblasts (bone-producing cells) that have become trapped in lacunae. These structures provide support and strength to the bone. The spaces within this tissue contain bone marrow (light purple), a blood forming substance.
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