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Pleural fluid is the fluid that is found between the layers of the pleura, the membranes that line the thoracic cavity and surround the lungs. The space containing the fluid is referred to as the pleural cavity or pleural space

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The thoracic cavity (or chest cavity) is the chamber of the body of vertebrates that is protected by the thoracic wall (rib cage and associated skin, muscle, and fascia). The central compartment of the thoracic cavity is the mediastinum.

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The pleural cavity is the space that lies between the pleura, the two thin membranes that line and surround the lungs. The pleural cavity contains a small amount of a thin fluid known as pleural fluid, which provides lubrication as the lungs expand and contract during respiration.

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The pleural membrane is thin, moist, slippery and has two layers. The outer, or parietal, pleura lines the inside of the rib cage and the diaphragm while the inner, visceral or pulmonary, layer covers the lungs. Between the two layers is the intrapleural space, which normally contains fluid secreted by the membranes.

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lobe of the lung - any of the three lobes of the right lung or the two lobes of the left lung. lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood.

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any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.

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Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall. The intercostal muscles are mainly involved in the mechanical aspect of breathing. These muscles help expand and shrink the size of the chest cavity to facilitate breathing.

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a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.

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any of the minute branches into which a bronchus divides.

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any of the major air passages of the lungs which diverge from the windpipe.

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a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.

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the membrane-lined cavity behind the nose and mouth, connecting them to the oesophagus.

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a flap of cartilage behind the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.

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the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals; the voice box.

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each of the pair of organs situated within the ribcage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed. Lungs are characteristic of vertebrates other than fish, though similar structures are present in some other animal groups.

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The nasal cavity (or nasal fossa) is a large air filled space above and behind the nose in the middle of the face. Each cavity is the continuation of one of the two nostrils.