The left lung is a little smaller than the right one (to make space for the heart), and is divided into the superior (upper) and inferior (lower) lobes. These are further separated into ten segments. The right lung is divided into the superior (upper), middle and inferior (lower) lobes. If the surface of the lungs could be spread out flat, the total surface area of the two lungs together would be over forty times greater than that of the outer surface of the human body, making them one of the largest organs. In adults, each lung is 25cm to 30cm long, with the right lung being a little larger than the left lung as the former has three lobes while the latter only has two. It is the wide depressed area located just a little higher than the center of the medial surface of the lungs. The structures of the root enter/leave the lung via the hilum. This root not only connects the two lungs with each other but also keeps them suspended in the thoracic cavity. Structures including the bronchus, bronchial veins and arteries, pulmonary artery, two of the pulmonary veins, pulmonary plexus of nerves (anterior and posterior), and lymphatic vessels bundle together to form the root of the lungs. The base is the concave lower surface of the lung that rests over the diaphragm.
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