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ThoraxThe thorax is a division of an animal's body, that lies between the head and the abdomen.In humans, the thorax is the region of the body that extends from the neck to the diaphragm, not including the upper limbs. The heart and the lungs reside in the thoracic cavity, as well as many blood vessels. This area is protected by the rib cage and the sternum.
An insect's thorax is one of the three main segments of the creature's body. It is the area to which the wings attach. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thorax".