Muscle Insertion: Definition & Function Explained

The end of a muscle that attaches to a movable bone and moves when the skeletal muscle contracts is called the insertion. Insertion is the site where a muscle attaches to the bone that will move as a result of the muscle's contraction. The other end of the muscle, which is attached to a relatively fixed bone or other structure, is called the origin.

When a muscle contracts, it generates force that pulls on the insertion. This pulling force causes the bone to move, resulting in joint movement. The specific movements produced depend on the location and orientation of the muscle, as well as the actions of opposing muscle groups.