ABSTRACT
Bones and Soft Tissues The chest wall is lean and is made up of skin, muscles, and minimal fat. The ribs, smoothly marginated and regularly spaced, form the lateral boundaries and extend anteriorly more than halfway around the thorax from their dorsal attachments (Fig. 1). The ribs also extend inferiorly to the upper abdomen. Therefore, observation of the ribs and abdominal structures in the same transverse plane should not be misinterpreted as pathologic.
