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Encyclopedia > Rib cage

This article is about the bones called ribs. For other meanings, see rib (disambiguation).

In anatomy, the ribs (Latin costae) are the long curved bones which form the rib cage. They surround the chest (Latin thorax) of land vertebrates. They protect the lungs, heart, and other internal organs of the thoracic cavity.

In mammals, obvious ribs only occur in the chest: fused-on remnants of ribs can be traced in development in neck vertebrae and sacral vertebrae. In reptiles, ribs sometimes occur in all vertebrae from the neck to the sacrum.

In fish, the full set is four ribs on each vertebra. This can easily be seen in the herring. Not all fish have the full set.

The human skeleton has 24 ribs, 12 on each side. (A small proportion have one pair more or fewer). They are attached to the vertebral column behind. The first seven pairs are connected to the sternum in front and are known as true ribs (costae verae, I-VII). The eighth, ninth, and tenth are attached in front to the cartilaginous portion of the next rib above and are known as false ribs (costae spuriae, VIII-X). The lower two, that is the eleventh and twelfth, are not attached in front and are called floating ribs (costae fluitantes, XI-XII). The spaces between the ribs are known as intercostal spaces; they contain the intercostal muscles, nerves, and arteries. The rib cage allows for breathing due to its elasticity. In some humans, the rib remnant of the 7th neck vertebra on one or both sides is replaced by a free extra rib called a cervical rib, which can cause trouble for the nerves going to the arm.

There is a legend that men have one rib fewer than women. This is false, and originates from the Bible's description of the creation of Eve (from the rib of Adam).

See also

  Results from FactBites:
Rib cage definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms (210 words)
Rib cage: The structure formed by the thoracic vertebrae and ribs, the sternum (breastbone), and the costal cartilages (that attach the ribs to the sternum).
The rib cage was thought to resemble an animal cage (although the largest "animals" it holds are the heart and lungs).
The rib cage is also called the thoracic cage.
Lungs in Rib Cage - Science Lesson Plan, Thematic Unit, Activity, Worksheet, or Teaching Idea (644 words)
The bottle's bottom is removed because in your body, the area below the rib cage is not rigid.
At the bottom of your rib cage, there is a floor made of solid muscle called the "diaphragm." Above your diaphragm is a fairly rigid box made of ribs.
If your rib cage were not fairly rigid, your lungs would not be squeezed.
  More results at FactBites »



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