sternum

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sternum:

see ribrib,
one of the slender, elongated, curved bones that compose the chest cage in higher vertebrates. Ribs occur in pairs, and are found in most vertebrates; however, in some lower vertebrates, including fishes, they run along the entire length of the backbone.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sternum

 

the complex of skeletal elements in terrestrial vertebrates and man that unite, along the midline of the body, the ventral ends of the true ribs and parts of the pectoral girdle and to which the sternal muscles are attached.

The sternum is a derivative of the ribs and first appeared in terrestrial vertebrates when a strengthening of support for the pectoral girdle was required in connection with the progressive evolution of the forelimbs. In amphibians and reptiles the sternum is usually cartilaginous; in the latter, only a few ribs are attached, forming the thorax. In birds the sternum is osseous; in flying birds there is a median process, the keel, to which the powerful pectoral muscles are attached. In mammals the sternum consists of three sections: the manubrium, the corpus sterni, and the xiphoid process. In man the sternum, or breastbone, is an unpaired flat bone that forms the middle part of the anterior wall of the thorax.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

sternum

[′stər·nəm]
(anatomy)
The bone, cartilage, or series of bony or cartilaginous segments in the median line of the anteroventral part of the body of vertebrates above fishes, connecting with the ribs or pectoral girdle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

sternum

1. (in man) a long flat vertical bone, situated in front of the thorax, to which are attached the collarbone and the first seven pairs of ribs
2. the corresponding part in many other vertebrates
3. a cuticular plate covering the ventral surface of a body segment of an arthropod
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
In this case it was possible to obtain information about the state of sternocostal complex and thoracic organs with indirect images about the morphological structures of the sternocostal complex and its parts (breast bone, cartilaginous part of the ribs) in different planes.
used to improve closure of the breast bone after open-heart surgery.
Two days later I had an MRI which showed cancer in the right breast, the breast bone, and the lymph nodes with a second, unrelated tumor in the right lung.
Incidentally, all references to "duck breasts" actually refer to the boneless medallions cut from either side of the breast bone.
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Just a week after graduating from drama school at 21, Samuel broke his breast bone in an accident.
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She suffered bleeding on the brain from a skull fracture and also fractured her right thigh, collar bone, shoulder blade and breast bone. She received 20 rib fractures which had punctured both her lungs, said Dr Carey, and she had suffered four fractures to her pelvis.
Roasted Cooked Chicken Crown on the breast bone teams the succulence of chicken cooked on the bone with the convenience of an all-but boneless product.
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* During production, the whole breast muscle (outer pectoral) must be carefully removed from the breast bone.