thoracic cavity

The thoracic cavity is the hollow space inside the chest that houses vital organs like the heart and lungs and is enclosed by the ribs, spine, and sternum, with the diaphragm forming its lower boundary. It is divided into pleural cavities for the lungs and a central mediastinum that contains the heart, major blood vessels, trachea, esophagus, and thymus.

What the thoracic cavity is

• The thoracic cavity is the second largest body cavity, located between the neck above and the abdominal cavity below.

• It is bounded by the thoracic wall (ribs, sternum, thoracic vertebrae, and associated muscles) and separated from the abdomen by the muscular diaphragm.

Main compartments inside

• The cavity is organized into three potential spaces: two pleural cavities (right and left) around each lung and one pericardial cavity surrounding the heart.

• The mediastinum lies between the lungs and stretches from the sternum to the thoracic vertebral bodies, subdivided into superior and inferior parts, with the inferior further divided into anterior, middle, and posterior regions.

Key organs contained

• Major organs include the lungs, heart, trachea, bronchi, esophagus, and thymus, along with large arteries and veins such as the aorta, pulmonary arteries and veins, and venae cavae.

• These structures are supported by networks of nerves and lymphatic vessels that run through the mediastinum and along the thoracic wall.

Openings and boundaries

• Superiorly, the thoracic cavity communicates with the neck through the superior thoracic aperture, bordered by the manubrium, first ribs, and T1 vertebra.

• Inferiorly, the larger inferior thoracic aperture is mostly closed by the diaphragm, which also provides passageways for the esophagus and major blood vessels between thorax and abdomen.

Information gathered from public forums or data available on the internet and portrayed here.