What is the primary function of sesamoid bones?

Sesamoid bones primarily function to reduce friction and protect internal joints, which enhances the efficiency of movement. These small, round bones are typically found embedded in tendons where they cross the ends of long bones. By providing increased leverage for muscles and acting as a shield for joints, sesamoid bones help to facilitate smooth joint motion during activities such as walking and running.

In contrast, flexibility, leverage, and strengthening weight-bearing joints are important roles played by various other bone structures or related components in the body but are not the primary function of sesamoid bones. Their unique positioning allows them to come into play specifically in reducing the stress on tendons and helping to maintain optimal joint function.