What is the primary characteristic of cancellous bone?

Cancellous bone, also known as trabecular or spongy bone, is characterized primarily by its high porosity. This type of bone has a lattice-like structure made up of trabeculae, which are thin struts or beams of bone tissue that create numerous small spaces or cavities. The high porosity of cancellous bone allows it to be lightweight while still providing structural support, enabling it to effectively absorb shock and distribute loads.

The porous nature of cancellous bone also facilitates the process of bone remodeling and contributes to its ability to house bone marrow, where blood cells are produced. This structural feature is essential for maintaining the overall health and function of the skeletal system, particularly in areas of the body where lighter weight and flexibility are important, such as the vertebrae and the ends of long bones.