What is "sesamoid bone"

n. (context anatomy English) A small bone embedded within a tendon, typically found in locations where a tendon passes over a joint.

n. any of several small round bones formed in a tendon where it passes over a joint [syn: os sesamoideum]

In anatomy, a sesamoid bone is a bone embedded within a tendon or a muscle. It is derived from the Latin word "sesamum" (sesame seed), due to the small size of most sesamoids. Often, these bones form in response to strain. Sesamoids act like pulleys, providing a smooth surface for tendons to slide over increasing the tendon's ability to transmit muscular forces.