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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 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 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.


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
References in periodicals archive ?
Because doctors didn't have to split the patient's breastbone to reach the heart, recovery time for the patient will be cut dramatically.
Symptoms: 6 Pain to one side of your breastbone that gets worse if you move, stretch or breathe deeply.
He broke his back in two places, fractured his pelvis, broke his breastbone, suffered deep cuts to his legs and suffered a detached lung when he was in collision with a van while riding his bike.
Over eight hours, with her heart stopped and a bypass machine keeping her alive, surgeon cut through her breastbone to replace five diseased coronary arteries.
The twins were joined from the breastbone to the top of the navel and had a shared liver but separate hearts.
Q I GET a pain behind my breastbone when I swallow and I feel food sticking sometimes.
Q I HAVE discomfort in my breastbone and an X-ray revealed an old injury of two broken ribs.
There are two that commonly can get very large - those in the groin and testicle area, called inguinal hernia, and those that are just below the breastbone, called epigastric hernia.
Cut open at the breastbone and just remove the breast fillets, and treat like chicken ( maybe cream and mushrooms?
For several years, I occasionally had the sensation of bubbles flowing upward along the left side of my breastbone.
Advice in the US and Canada, where they have had experience of airbags for many years, is that the distance between the centre of the steering wheel to the breastbone should be at least 10 inches.
Advice in the US and Canada, where they have had experience of airbags for many years, is that the distance between the centre of the steering wheel and the breastbone should be at least 10 inches (25cm)," says GEM chief executive David Williams.