First lines of physiology, being an introduction to the science of life; written in popular language . d openso as to expose thecavity of the chest bythe removal of thesternum and the carti-lages of the true upper or first pairof ribs being naturallyprovided with little ifany cartilage, appearsas a pair of perfectbones. The fleshy andbony walls of the chestare seen at 1, 1. 560. At the numbers2, 2, you see a broad,thin muscular organcalled the is this which com-pletes the division be-tween the thorax andthe abdomen. It arises,by tendinous fibres, fromthe front of the spin
First lines of physiology, being an introduction to the science of life; written in popular language . d openso as to expose thecavity of the chest bythe removal of thesternum and the carti-lages of the true upper or first pairof ribs being naturallyprovided with little ifany cartilage, appearsas a pair of perfectbones. The fleshy andbony walls of the chestare seen at 1, 1. 560. At the numbers2, 2, you see a broad,thin muscular organcalled the is this which com-pletes the division be-tween the thorax andthe abdomen. It arises,by tendinous fibres, fromthe front of the spine inthe lumbar region, andby fleshy fibres from the cartilages and bones of thefalse ribs as well as from the ensiform cartilage. Themiddle of the diaphragm, where the figures are placed,is composed of tendinous matter, and the whole consti-tutes a broad, thin, complex muscle, forming a divisionbetween the cavities of the chest and abdomen. It ispenetrated by the oesophagus on its way to the stomach,by the aorta (264) conveying the blood towards thelower extremities, and by the ascending vena cava. Section of the Great Cavities. 244 OF THE GREAT CAVITIES. (263) and the thoracic duct (197) on their way towardsthe heart. 561. The diaphragm may be readily compared to aninverted basin, its bottom being turned upward into thethorax while its edge corresponds with the outline ofthe lower edges of the false ribs and the sternum. Itscavity being directed towards the abdomen, it enlargesthat cavity very much at the expense of that of thechest, which it contracts to an equal extent, as you seein fig. 50. 562. Having now completed our view of the walls ofthe thorax, it will be proper to say something of itsprincipal contents. The cavity of the chest is almostexclusively occupied by the right and left lungs (249),the heart, and great vessels (264). The heart is situatedbetween the two lungs, but extends much farther to theleft than the right, thus rendering the left lung smallerthan its fe
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Keywords: ., bookcentury1800, bookdecade1840, bookidfirstlinesof, bookyear1846
