Fourth rib

Bones · Latin: Quarta costa

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== Structure of the rib cage ==

Ribs are described based on their location and connection with the sternum.

All ribs are attached posteriorly to the thoracic vertebrae and are numbered accordingly one to twelve.

Ribs that articulate directly with the sternum are called true ribs, whereas those that do not articulate directly are termed false ribs.

Definition from Wikipedia, CC BY-SA 4.0.