Relating to both cartilage and the sternum (breastbone).
From Greek chondros (cartilage) + Latin sternalis (relating to the sternum). The term emerged in anatomical terminology to describe the cartilaginous portions of rib attachments to the breastbone.
The chondrosternal joints in your rib cage are made of cartilage, not bone, which is why your chest can expand when you breathe—if they were rigid bone, you couldn't fill your lungs.
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