sternum
A flat, narrow bone that extends from the base of the neck to just below the diaphragm in the center of the chest. The sternum or breastbone consists of three sections: a triangular upper part called the manubrium; a long narrow middle part called the body or gladiolus; and a lower, more flexible cartilaginous part, shaped like a leaf, called the xiphoid process. The top of the manubrium articulates with, and is attached by ligaments to, the inner ends of the two clavicles (collarbones). The sides of the manubrium and body are joined to the ribs by seven pairs of costal cartilages. Between the manubrium and body is a type of joint known as a symphysis, which allows slight movement between these two parts of the sternum when the ribs rise and fall during breathing.
Related entry
• rib cage
Related category
• ANATOMY AND PHYSIOLOGY
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