Clinicians in both veterinary and humans medicine spend a great deal of time examining the thorax, particularly in auscultation of the lung and heart, there are also other diagnostic procedures, such as percussion of the lungs and heart and palpation of the cardiac area. This work to establishment the gross anatomy, normal X-ray, ultrasonography and CT images of the thorax referring to their normal cross-sectional anatomy to study the thorax and thoracic contents, and to identify the most clinical application of the thorax