DEFINE THRORACIC CAVITY . IT FUNCTIONS ALSO
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The thoracic cavity, also called the chest cavity, is a cavity of vertebrates bounded by the rib cage on the sides and top, and the diaphragm on the bottom. The chest cavity is bound by the thoracic vertebrae, which connect to the ribs that surround the cavity. The thoracic cavity is actually composed of three spaces each lined with mesothelium, a special film-like tissue that separates vital organs. The pleural cavities surround the lungs, while the pericardial cavity surrounds and protects the heart.The thoracic cavity has two openings, one from the top leading to the mouth and throat, and the other allowing the esophagus and other important vessels and tissues to pass between the thoracic cavity and the abdominal cavity. The thoracic inlet allows the esophagus and trachea to penetrate the thoracic cavity. The esophagus will pass all the way through the cavity to connect with the stomach, while the trachea lead to the bronchi of each lung which lead to smaller and smaller passages that fill the lungs. Nerves, blood vessels, and lymph vessels pass through the thoracic inlet to carry material to and from the head and mouth. The thoracic outlet is the opening on the posterior side of the cavity, which leads to the gut. Again, nerves and vessels traverse this outlet to leave the thoracic cavity. Functions: The thoracic cavity has several functions. The first is to provide protection and support to the body’s vital organs. The thoracic cavity is surrounded by the rib cage and several layers of membranes, which help keep the organs protected from any dangers in the environment. The heart must be kept in a relatively safe and stable position if it is to continue beating and providing pressure to the body’s vessels. In addition to providing support, the rib cage functions in unison with the diaphragm and other muscles to draw air in and out of the lungs. If any of the cavities surrounding these vital organs get punctured, the resulting pressure can cause the lungs to collapse or pressure to be exerted on the heart, which can cause a heart attack.
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