Scanning electron microscope (SEM) of human bone tissue. Colored scanning electron micrograph of cancellous (spongy) bone. Cancellous bone is found in the interior of bones. Cancellous bone is characterized by a honeycomb arrangement, comprising a network of trabeculae (rod-shaped tissue). These structures provide support and strength to the bone. The spaces within this tissue contain bone marrow (not seen), a blood forming substance. This image is x150 when printed 10 cm wide.