Sternum
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The sternum in this cut consists of two bones. The first is broad and thick above, and contracts as it descends. It is convex before and concave behind. At the upper angle a, the collarbone is articulated; b, the articular surface for the cartilage of the first rib; b, for the second rib; c,d,e,f,g, mark the articular surfaces of the 3rd, 4th, 5th, 6th, and 7th ribs; h, the ensiform cartilage, terminates the lower extremity of the sternum. In older people, this cartilages is often changed into bone.
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Human Skeletal SystemSource
Lee, Charles A. Human Physiology for the Use of Elementary Schools, 11th ed. (Buffalo: J. C. Derby & Co., 1847) 84
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