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http://www.poultryhub.org/anatomy-and-physiology/skeletal-system/
Ribs
There are seven pairs of ribs originating on the thoracic vertebrae. The first, second and sometimes the seventh do not reach the sternum, their other attachment, while the third to sixth and sometimes the seventh do. The third to the sixth have two segments:

Ribs
There are seven pairs of ribs originating on the thoracic vertebrae. The first, second and sometimes the seventh do not reach the sternum, their other attachment, while the third to sixth and sometimes the seventh do. The third to the sixth have two segments:
- Vertebral segment
- Sternal segment
