In the following Thoracic Vertebrae labeled diagram, we have shown the Posterior and Anterior sides. As we see here, the labeled diagram has a transverse process, superior articular facet, pedicle, superior demifacet, vertebral body, vertebral foramen, facet for tubercle of rib, lamina, and spinous process. The purpose of a labeled diagram is very simple -- provide the context of a diagram to the viewer. Since it becomes difficult for the readers to understand the diagram without context, labeling them would be an important key here. It should be noted here that when needed, you should provide labels and, if applicable, accompanied explanation for each part of the diagram right inside the diagram. This way, the labels, and explanations will be together in an integrated format instead of a split-source format.