Rib cage and Skeletal structure

Rib cage noun - The bony enclosing wall of the chest.

Skeletal structure and rib cage are semantically related. In some cases you can use "Skeletal structure" instead a noun phrase "Rib cage".

Skeletal structure noun - Any structure created by the skeleton of an organism.

Rib cage and skeletal structure are semantically related. Sometimes you can replace phrase "Rib cage" with "Skeletal structure", this phrases are similar.