Cancellous bone, also known as trabecular or spongy bone, is a type of bone tissue found primarily at the ends of long bones, within the interior of others, and in the vertebrae. It has a porous, lattice-like structure that makes it lighter than compact bone while still providing strength and support. This unique design allows for the efficient distribution of weight and stress during physical activities. The spaces within cancellous bone are filled with bone marrow, which is essential for producing blood cells. This type of bone is particularly important for overall skeletal health, as it helps absorb shock and reduce the risk of fractures. Cancellous bone plays a crucial role in the body's ability to adapt to various physical demands.