Though cancellous bone only makes up about 20 percent of the body's bone mass, it plays important roles in body function. New blood cells are produced within these marrow-filled spaces. The latticework of tiny chambers is filled either with bone marrow or connective tissue. However, instead of a network of bone structure with periodic gaps, cancellous bone is more like a network of connecting spaces with periodic structure. It's formed by trabeculae, which are needlelike structures that create a meshwork. Cortical bone makes up 80 percent of bone mass and is dense, strong and rigid.Ĭancellous bone tissue is the inner layer of bone and is much less dense than cortical bone. The periosteum contains capillaries that are responsible for keeping the bone nourished with blood. Think of the periosteum as a utility vest that fits over the bone - it has brackets and places for muscles and tendons to attach. There are three types of bone tissue: cortical tissue (the outer layer), cancellous tissue (the inner layer) and subchondral tissue (the ends of bones).Ĭortical bone tissue is covered by a fibrous membrane called the periosteum.
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