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Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.
 
 
4a. The Sternum
 
  
(Breast Bone)


FIG. 115– Anterior surface of sternum and costa cartilages. (See enlarged image)

  The sternum (Figs. 115 to 117) is an elongated, flattened bone, forming the middle portion of the anterior wall of the thorax. Its upper end supports the clavicles, and its margins articulate with the cartilages of the first seven pairs of ribs. It consists of three parts, named from above downward, the manubrium, the body or gladiolus, and the xiphoid process; in early life the body consists of four segments or sternebrœ. In its natural position the inclination of the bone is oblique from above, downward and forward. It is slightly convex in front and concave

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