The major structures of the thorax include the thoracic cage and the thoracic cavity. The thoracic cage is comprised of ribs, sternum , and clavicles; its function is to protect the thoracic cavity.

The thoracic cavity is comprised of the trachea , lungs, and pleural membranes; its primary function is to support breathing. The muscles and structures of one’s thorax also play a big part in determining if a patient’s breathing is effective or efficient.

lymphatic system — system of vessels, cells, and organs that carry excess fluids to the bloodstream and filter pathogens from the blood through lymph nodes. lymph — interstitial fluid that has entered the lymphatic system. thorax — the area of the body commonly known as the chest. thoracic cavity — comprised of the trachea , lungs, and pleural membranes; its primary function is to support breathing.