What function do sesamoid bones primarily serve?

Sesamoid bones primarily serve the function of eliminating friction in joints and increasing the efficiency of motion. By being embedded within tendons, particularly in areas where tendons cross joints, sesamoid bones help to improve the mechanical advantage of the muscles involved in movement. This can lead to enhanced force generation during activities like walking, running, or jumping, as they modify the direction of force application and reduce wear on the surrounding structures.

The presence of sesamoid bones also acts to protect the tendon they sit within, further contributing to their role in minimizing friction during joint movement. This unique positioning allows for smoother, more efficient motion, which is crucial for overall joint function and mobility.