The<unk>  represents the boundaries of the<unk>  cavity. The<unk>  is split into the posterior (back), lateral (sides) and anterior (front)<unk> s.
There is a common set of layers covering and forming all the<unk> s: the deepest being the extraperitoneal fat, the parietal peritoneum, and a layer of fascia which has different names over where it covers (eg transversalis, psoas fascia).
Superficial to these, but not present in the posterior<unk>  are the three layers of muscle, the transversus abdominis (tranvserse<unk>  muscle), the internal (obliquus internus) and the external oblique (obliquus externus).
Abdominal wall
Operon
Abdomen
Dorsum 
Chest
Thoracic cavity
Lymphatic tissues
Sternum