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Asymmetry is not unusual The Welsh sow had 16 to 17 pairs of ribs compared with an average of all British pigs of 14. http://wgpublications.com/index.html?ref=news&sid=224&action=view&show=25 I hope that helps.
A. Both men and women have 24 ribs, twelve on each side. Each rib is attached to a spinal bone (thoracic vertebra) in the back.The first seven pairs of ribs join the breastbone (sternum) in the center of the chest. The front ends of the eighth, ninth, and 10th pairs are connected to the ribs above them.The 11th and 12th pairs are called âfloating ribs,â because they are anchored in place only by connective tissue.One in every few hundred people have an extra rib.he front ends of the eighth, ninth, and 10th pairs are connected to the ribs above them. The 11th and 12th pairs are called âfloating ribs,â because they are anchored in place only by connective tissue. One in every few hundred people have an extra rib.