Which bone type is classified as tiny and usually found along tendons?

Sesamoid bones are classified as tiny bones that are typically found within tendons. Their primary function is to reduce friction and modify pressure on tendons, allowing for smoother movement and greater efficiency during muscle contractions. They also contribute to the stability of the joint at which they are located.

In human anatomy, a well-known example of a sesamoid bone is the patella, or kneecap, which sits within the tendon of the quadriceps muscle. This adaptation is crucial for joint mechanics and helps protect tendons from stress and wear.

Other bone types mentioned do not fit this description. Pneumatic bones are hollow and contain air spaces, which are primarily found in birds to reduce weight for flight. Small bones, although a broad term, do not specifically refer to those located along tendons. Long bones, such as the femur or humerus, are characterized by their elongated shape and are primarily involved in supporting the body's structure and facilitating movement, rather than functioning as sesamoid structures.