Diagram of a tsetse fly, showing the head, thorax and abdomen
The 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 and legs attach.
Thoracic disc prolapse is rare an event due to the bony thoracic cage permitting limited movements, the anterior-posterior direction of the apophyseal joints, and relatively small size of thoracic disc.
The thoracic cord is restrained from backward displacement by the dentate ligaments.
Circulation to the lower thoracic region is precarious and largely due to single artery of Adamkiewicz which usually arises between T8 and L4 on the left side in 60% of cases.
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