Elements of animal physiology, chiefly human . lUght Auricle (ofHeart). EonyAxisof , Large IntestineTransverse Colon). Small IntestLues. Fig. 2. Front view of the Organs of the walls of the thorax are strengthened for the moresecure protection of their visceral contents by a bony cage-work, consisting of the ribs, the dorsal portion of the THIS CAVITY OF THE ABDOMEN. 25 back-bone, and the breast-bone. The sternum (breast-bone) and the front portions of the ribs (the cut ends ofwhich are seen) are supposed to be removed in fig. 2, inorder to expose the contained organs. T
Elements of animal physiology, chiefly human . lUght Auricle (ofHeart). EonyAxisof , Large IntestineTransverse Colon). Small IntestLues. Fig. 2. Front view of the Organs of the walls of the thorax are strengthened for the moresecure protection of their visceral contents by a bony cage-work, consisting of the ribs, the dorsal portion of the THIS CAVITY OF THE ABDOMEN. 25 back-bone, and the breast-bone. The sternum (breast-bone) and the front portions of the ribs (the cut ends ofwhich are seen) are supposed to be removed in fig. 2, inorder to expose the contained organs. The cavity of the thorax contains the chief blood-puri-fying and hlood-circulating organs. 36. Transverse Section of the Thorax.—The followingdiagram sufficiently explains the structure of the thoraxand its contents, as displayed by a section across the heartand lungs perpendicular to the vertebral column (back-bone), the outer integument and layer of subcutaneous fat having been Transverse Section of the Thorax. a, Aorfa (ascending), h, Right Pulmonary Vein, c, llight Eib. d, InteiTal between twoSmfaceg of Eight Pleura, e. Right Lung. /, Eight Bronchus g, Vertebra, h, CEsc)phagus.«, Aorta (descending), j, Left Lung, k. Left Bronchus. I, Left Pleura, m, Left Rib. n, LeftPulmonary Vein, o, Pulmonary Avtery. p. Heart, q, Pericardium. 37. The Cavity of the Abdomen, situated immediatelytdow the diaphragm, contains the liver, the stomach, thelarge and small intestines, and the bladder, also the lumbarportion of the back-bone and spinal cord, pancreas, thespleen, and the kidneys, not shown in fig. 1. The cavity 26 ANIMAL PHYSIOLOGY of the abdomen thus contains the principal hlood-formmgorgans. 38. Hints for Lay Students of Physiology.—The youngstudent should learn quickly to distinguish between theterms hocly and trunk. He should also make himselfthoroughly familiar with \X\q forms of the various organs,and the positions they occupy in the living body. Hesho
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