Structure of Bone

Our skeleton is more than just bones; it also includes cartilage and ligaments. Together, these structures form the skeletal system, which keeps us upright and moving.

The main framework of this system is bones, which are living tissues surrounded by a thin layer known as periosteum.

As we move inside, we find two different layers. The outer compact bone is dense and strong, while the spongy bone inside is lighter and contains tiny spaces for flexibility. Within these spaces, bone marrow produces blood cells.

Next, we have cartilage, a tough yet flexible connective tissue at the ends of bones. It cushions joints and helps bones move smoothly.

Finally, ligaments are strong bands of protein fibers that connect bones, keeping joints stable.

This skeletal system isn’t fixed; it changes as we grow. When babies are born, their skeletons are mostly cartilage, making them flexible. As they grow, this cartilage is replaced by bone, allowing bones to get longer.

And when you jump, run, or lift things, your bones grow thicker and stronger to adapt to movement and stress.