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thorax
The anterior region of the trunk of an animal. In vertebrates, the thorax is the region of the body containing the heart and lungs within the rib cage. Only in mammals is it clearly marked off from the abdomen by the diaphragm.
In insects, the thorax is the second body region, located between the head and abdomen. It is the region where the legs and wings are attached. In other arthropods, especially crustaceans and arachnids, the thorax is fused with head to form a cephalothorax.
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