Cancellous bone

As cancellous bone (from Latin spongia " sponge " ) or cancellous bone, a manifestation of the bone is called. It is a sponge-like system constructed of fine trabeculae ( trabeculae ). In the flat bones is called the cancellous bone as diploe. The cancellous bone is located in the interior of the bone and is covered towards the outside of the cortex ( substantia compacta ). In the cavities formed by the trabeculae of the " sponge " is the bone marrow.

Design principle

The cancellous bone forms a closely -linked scaffold, with most trabeculae along the major stress lines ( stress trajectories ) are arranged in the bone. The architecture depends on whether the portion of the bone is primarily exposed to pressure, for example the vertebrae, or bending and torsional forces, such as the femoral head. This lightweight principle allows the saving of bone substance at a sufficiently high stability and thus a lower weight of the bone.

Histogenesis

In the context of osteogenesis initially woven bone formed either from cartilage ( chondral osteogenesis ) or directly from Bindegewebsstammzellen ( intramembranous osteogenic ). Similar to the cancellous bone, there is a mesh of fine bone trabeculae, which, however, are interlaced into each other, forming in this case no organized structure. On the surface of the bone by compaction and accumulation of further bone, the cortex. Inside the remodeling of cancellous bone due to the partial degradation of the bone matrix by osteoclasts and the orderly formation of the characteristic trabeculae happens. These form a lattice structure, which dynamically adapts even after completion of bone growth of the strains of the bone.