Rib cage
The rib cage is the arrangement of ribs attached to the vertebral column and sternum in the thorax of most vertebrates, that encloses and protects the heart and lungs. In humans, the rib cage, also known as the thoracic cage, is a bony and cartilaginous structure which surrounds the thoracic cavity and supports the shoulder girdle to form the core part of the human skeleton. A typical human rib cage consists of 24 ribs in 12 pairs, the sternum and xiphoid process, the costal cartilages, and the 12 thoracic vertebrae.
Dinocephalosaurus
The trunk of "Dinocephalosaurus" has at least 26 vertebrae. In "Dinocephalosaurus", there appear to be no lumbar vertebrae, or vertebrae of the trunk lacking ribs. The ribs of the sacrum and tail also do not appear to be fused to their corresponding vertebrae. Each of the gastralia in "Dinocephalosaurus" is composed of three elements instead of four as in "Tanystropheus"; they differ in that "Dinocephalosaurus" only has one element on the midline, while "Tanystropheus" has two elements that combine to form a midline bar.