The fixed end of the muscle is called the origin and the movable end is called the insertion. The immovable end of the muscle is called its origin and the movable end is called the insertion, while the antagonist is the muscle that works against the prime mover. Cords of connective tissues also bind bone to bone across joints, these are called ligaments. The two attachments of a muscle are called the origin and the insertion. The origin is the end of the muscle which is nearer to the midline of the body, which is more proximal, or less movable.
