The distance between the angle and the tubercle is progressively greater from the second to the tenth ribs. If the rib be laid upon its lower border, the portion of the body in front of the angle rests upon this border, while the portion behind the angle is bent medialward and at the same time tilted upward as the result of the twisting, the external surface, behind the angle, looks downward, and in front of the angle, slightly upward. At this point the rib is bent in two directions, and at the same time twisted on its long axis. The external surface is convex, smooth, and marked, a little in front of the tubercle, by a prominent line, directed downward and lateralward this gives attachment to a tendon of the Iliocostalis, and is called the angle. The body or shaft is thin and flat, with two surfaces, an external and an internal and two borders, a superior and an inferior.
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