. Cunningham's Text-book of anatomy. Anatomy. 1084 THE EESPIEATOEY SYSTEM. Costal part of parietal pleura Pleural cavity ,. Visceral pleura Costal part of parietal pleura Pleural cavity /•^Visceral pleura marked projection of the heart to the left side, and to the position of the thoracic aorta on the left side of the median plane, the left pleural chamber, although it is deeper than the right, is greatly reduced in width. The two pleural cavities, therefore, are very far from being symmetrical in form, and consequently the mediastinal septum tends to extend to the left of the median plane of
. Cunningham's Text-book of anatomy. Anatomy. 1084 THE EESPIEATOEY SYSTEM. Costal part of parietal pleura Pleural cavity ,. Visceral pleura Costal part of parietal pleura Pleural cavity /•^Visceral pleura marked projection of the heart to the left side, and to the position of the thoracic aorta on the left side of the median plane, the left pleural chamber, although it is deeper than the right, is greatly reduced in width. The two pleural cavities, therefore, are very far from being symmetrical in form, and consequently the mediastinal septum tends to extend to the left of the median plane of the body. Each pleural cavity is completely lined by a separate serous membrane termed the pleura. The portion of this membrane which clothes the mediastinum or intervening partition forms the lateral boundary of an area termed the mediastinal or interpleural space, within which the parts which build up the mediastinal septum are placed. PLEURA. The pleura of each side not only lines the corresponding pleural cavity, but at the pulmonary root, it is prolonged on to the lung so as to give it a complete investment. It is customary, therefore, to recognise a pulmonary or investing part (pleura pulmonalis) and a parietal or lining part (pleura parietalis). The inner surface of the pleura { that surface which is turned towards the interior of the cavity) is coated with squamous endothelium, and presents a smooth, glistening, and polished appearance; further, it is moistened by a small amount of serous fluid. In consequence of this the surface of the lung covered by pulmonary pleura can glide on the wall of the cavity, lined as it is by parietal pleura, with the least possible degree of friction. In the patho- logical condition known as pleurisy the inner surface of the pleura becomes roughened by inflam- matory exudation, and the so-called "friction sounds" are heard when the ear is applied to the chest. Pleura Pulmonalis.—The pul- monary pleura is very thin, and i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
