Which type of bone is described as spongy and found in the interior of bones?

Cancellous bone, also known as trabecular or spongy bone, is the type of bone that is characterized by its porous and lightweight structure. It is located primarily in the interior of bones, particularly in the ends of long bones and in the interiors of others like the vertebrae. The spongy architecture allows for the storage of bone marrow and plays a crucial role in the production of blood cells.

This type of bone is essential because it provides a supportive framework while reducing overall bone density. Its lattice-like configuration can withstand various stresses while still being less dense than compact bone. This design helps to absorb impact and reduce the overall weight of the skeletal system, making it easier for the body to move and function.

In contrast, cortical bone (also known as compact bone) is dense and forms the outer layer of bone, providing strength and support. It's important to differentiate between these different types of bone when studying their functions, as their structures are adapted to meet specific mechanical needs within the body.