JAMES STEVENSON / SCIENCE PHOTO LIBRARY. JAMES STEVENSON / SCIENCE PHOTO LIBRARY.
Photograph of the human sternum, the breast bone, seen in posterior (rear) aspect. The sternum is a flat bone (15-20 cm long) that extends from the base of the neck to just below the diaphragm and forms the front part of the skeleton of the thorax. It consists of 3 sections: the manubrium (top, triangular shaped), which articulates with the collar bones and 1st pair of ribs; the middle body (mesosternum) which accommodates the next 6 pairs of ribs, and the xiphoid process at bottom. Remants of the 6th and 7th ribs may be seen at bottom left.
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