In the adult human body, there are typically 206 bones. This number can vary slightly due to anatomical variations, such as additional small bones called sesamoid bones that can develop in some individuals. The skeletal system provides structure, support, and protection to the body, while also serving as an attachment point for muscles and playing a crucial role in movement. Bones also house bone marrow, where blood cells are produced, and store essential minerals like calcium and phosphorus. The total number of bones is greatest in infants, as they start with around 270 bones that fuse together as they grow.