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body division found in certain animals. In humans and other mammals it lies between the neck and abdomen and is also called the chest. The skeletal frame of the thorax is formed by the sternum (breastbone) and ribs in front and the dorsal vertebrae in back. Within the thoracic cavity are the heart, lungs, and esophagus. The chest and abdominal cavities are separated by a muscular structure, the diaphragm. In insects and other arthropods the thorax is a body division consisting of several segments lying between the head and abdomen, to which are attached legs or other appendages.



the upper (in humans) or anterior (in most vertebrates) part of the trunk.

The shape of the thorax is determined by its skeleton—the chest and pectoral girdle—and by the muscles arranged on its surface. In arthropods the thorax is the section between the head and the abdomen. In primitive crustaceans (for example, Phyllopoda) the segments of the thorax are numerous and not constant in number; they bear nonspecialized appendages, equipped simultaneously for swimming, chewing, and breathing (gills). In higher crustaceans the number of segments of the thorax is reduced to between four and eight and becomes constant; part of the segments fuse with the head and their appendages become maxillipedary. In Arachnida and Xiphosura the segments of the thorax bear four pairs of gressorial legs and are usually merged with the head into a cephalothorax. In insects the thorax consists of three segments (prothorax, mesothorax, and metathorax), to each of which is attached a pair of legs; in higher insects one pair of wings each is attached to the mesothorax and metathorax in the adult stage.


The chest; the cavity of the mammalian body between the neck and the diaphragm, containing the heart, lungs, and mediastinal structures. Also known as thoracic cavity.
(invertebrate zoology)
The middle of three principal divisions of the body of certain classes of arthropods.


1. the part of the human body enclosed by the ribs
2. the corresponding part in other vertebrates
3. the part of an insect's body between the head and abdomen, which bears the wings and legs
References in periodicals archive ?
The right lateral costal branch originates from the internal thoracic artery two cm from where the latter begins in the plane of the endothoracic fascia, deep in relation to intercostal VAN close the intercostal lymph node (Fig.
Clinical interpretation: The patient's description of his pain, paresthesia and heaviness in non-dermatomal pattern may indicate a thoracic dysfunction.
A 64-row MDCT scanner (Toshiba Aquilon, Toshiba Medical Systems, Otawara, Japan) was used for all the thoracic CT procedures following standard thorax protocol.
7] As lower thoracic spine sustains greater forces due to frequent motion, severity of OLF increases as thoracolumbar junction is approached.
Zenith Alpha Thoracic is the newest addition to a growing portfolio of clinically proven Zenith endovascular grafts and procedural accessories in the US.
Among the 95 patients with thoracic myelopathy caused by OLF, seven cases (7.
Proximal to aneurysm, ascending thoracic aorta diameter was 3.
A 40-years-old man sustained a decelerating thoracic aortic injury following a motor vehicle collision.
Thoracic duct cysts are uncommon entities that are usually found in the thoracic segments of the thoracic duct.
Also, athletes in sport where the thoracic and/or lumbar spine are maintained in flexion, such as in paddlers (Lopez-Minarro et al.
Similar to the original Heli-FX system that was cleared for European distribution in May 2011 and designed for treating abdominal aortic aneurysms (AAA), the new system consists of a longer delivery device with additional tip configurations to bring the innovative helical EndoAnchor technology to the treatment of thoracic aortic aneurysms (TAA).
Oxford Specialist Handbooks in Anaesthesia: Thoracic Anaesthesia.