Rib
Ribs are classed as flat bones which usually have a protective role in the body. Humans have 24 ribs, in 12 pairs. All are attached at the back to the thoracic vertebrae, and are numbered from 1–12 according to the vertebrae they attach to. The first rib is attached to thoracic vertebra 1 (T1). At the front of the body most of the ribs are joined by costal cartilages to the sternum. The ribs connect to the vertebrae with two joints, the costovertebral joints.
Ziony Zevit
In an article published in 2001, Scott F. Gilbert and Zevit argue that the Bible might be interpreted that Eve was not made from Adam’s rib, but his baculum; which would explain why humans don't have one. Zevit's article published in "Biblical Archaeology Review" in 2015 presents the same theory and attracted certain public attention.