So the point where the muscle attaches to our movable bone via the tendon, that is known as our insertion. So the radius and the ulna are the movable bones. Our humerus is the immovable bone and this is our proximal end. It contains the origin, this is the distal end, it contains our insertion. Now of course, we actually have the joints that allow the movement of these bones with respect to each other. So we have the joint that connects our humerus to our shoulder bone, the flat bone known as the scapula, and we have the joint in our elbow as shown.