regional_part_of Back of thorax Dorsum of thorax FMA:24217 Posterior part of thorax Subdivision of thorax, which is the posterior part of the thorax and is demarcated from the chest by the external surface of the posterolateral part of the rib cage and the anterior surface of the thoracic vertebral column; together with the chest, it constitutes the thorax. Examples: There is only one chest. Thoracic back Thoracic part of back fma Back of trunk Subdivision of back of trunk Thoracic segment of trunk Thoracic segment of male trunk Thoracic segment of female trunk