Ribs

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Original Editor - Lucinda hampton Top Contributors - Lucinda hampton, Kim Jackson and Joao Costa

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Top Contributors - Lucinda hampton, Kim Jackson and Joao Costa  

Introduction

The ribs are the bony framework of the thoracic cavity.

• There are twelve pairs of ribs.
• Each rib articulates posteriorly with two thoracic vertebrae by the costovertebral joint. An exception to this rule is that the first rib articulates with the first thoracic vertebra only.

According to their attachment to the sternum, the ribs are classified into 3 groups: true, false, and floating ribs.

1. The true ribs are the ribs that directly articulate with the sternum with their costal cartilages - ribs 1-7. They articulate with the sternum by the sternocostal joints. The first rib is an exception to that rule; it is a synarthrosis and the first rib could uniquely articulate with the clavicle by the costoclavicular joint
2. The false ribs (8,9,10) are the ribs that indirectly articulate with the sternum, as their costal cartilages connect with the seventh costal cartilag by the costochondral joint.
3. The floating ribs (11,12) do not articulate with the sternum at all (distal two ribs).

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