Thorax (human anatomy)

The thorax is the chest cavity—the region of the body between the neck and abdomen—enclosed by the ribcage, spine, and muscles. It houses vital organs and serves as a protective chamber for life-sustaining structures.

The thorax contains the heart, which pumps blood throughout the body, and the lungs, which exchange gases through respiration. Between them lies the mediastinum, a central compartment holding the esophagus, major blood vessels, and nerves. The diaphragm forms the floor, contracting to enable breathing.

The ribcage—twelve pairs of ribs articulated to the thoracic vertebrae and sternum—acts as an armored shell. Intercostal muscles between the ribs assist in breathing. The skin and underlying tissues create layers that scientists study through anatomical dissection and modern imaging.

Understanding thoracic anatomy is essential for medical practice, whether diagnosing pneumonia, performing surgery, or understanding how blood circulation reaches every part of the body. Even spatial reasoning about organ placement reveals the elegant efficiency of human design.

Related

Lungs, Heart, Rib cage, Diaphragm (anatomy), Mediastinum, Respiration