Fig. 39-12. Scheme of horizontal sections of vertebrae, showing what are thought to be corresponding parts. Note that the costal element forms a part of the transverse process of a cervical vertebra. It forms the rib in the thoracic region, most of the transverse process in the lumbar region, and the greater portion of the lateral part of the sacrum. In the cervical vertebra, the posterior tubercle of the transverse process should probably also be shaded as part of the costal element. Click for high resolution image.