Medically reviewed by Jennifer Steinhoff, MD Key Takeaways The thoracic spine is made up of 12 bones that attach to your ribs and support your rib cage.Excessive curvature in the thoracic spine, ...

The lumbar vertebrae are the largest movable bones of the backbone. Their large size and bone strength is necessary because these vertebrae support more weight than the upper two segments of the ...

In Panderichthids (rhipidistian fish ancestors of amphibians), 2 sets of ossifications are present in the centra region. At posterior end, below the neural arch, are pleurocentra. This element gave ...

Medically reviewed by Chris Vincent, MD Key Takeaways The ilium, a bone that forms part of the pelvis, helps bear weight and supports the spine when you stand and move.Ilium pain can be caused by ...

Spondylolisthesis (pronounced spahn-duh-low-liss-thee-sus) is a condition in which one of the bones in your spine (the vertebrae) slips out of place and moves on top of the vertebra next to it. It ...