. Animal physiology. Physiology, Comparative; Physiology, Comparative. 198 POSITION OF THE HEART IN MAN. Circulating Apparatus of the Higher Animals. 255. In Man, and those animals which approach him most nearly in structure, the heart is situated between the lungs in the cavity of the chest, which is termed by anatomists the thorax. Its form is somewhat coni- cal; the lower extremity tapering almost to a point, and the upper part being much larger. The lower end is quite unattached, and points rather forwards and to the left; during the contraction of the heart, it is tilted forwards, and str
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 198 POSITION OF THE HEART IN MAN. Circulating Apparatus of the Higher Animals. 255. In Man, and those animals which approach him most nearly in structure, the heart is situated between the lungs in the cavity of the chest, which is termed by anatomists the thorax. Its form is somewhat coni- cal; the lower extremity tapering almost to a point, and the upper part being much larger. The lower end is quite unattached, and points rather forwards and to the left; during the contraction of the heart, it is tilted forwards, and strikes against the walls of the chest, between (in Man) the fifth and sixth ribs. It is from the large or upper extre- mity, that the great ves- sels arise; and these, being attached to the neighbour- ing parts, serve to suspend the heart, as it were, in a cavity in which its move- ments may take place freely. This cavity is lined by a smooth serous membrane, which, near its top, is reflected downwards over the vessels, and covers the whole outer surface of the heart. Hence as the surface of the heart, and the lining of the cavity in which it works, are alike smooth, and are kept moist (in health) with a fluid secreted for the purpose, there is as little interruption as possible from friction, in the working of this important machine. 256. We may stop to explain the mode in which this peri- cardium (or membrane, surrounding the heart) is disposed; be-. Fig. 115.—Lungs, Heart, and principal vessels of Man. ar, right auricle; vr, right ventricle; vl, left ventricle; a, aorta; vc, vena cava; ac, carotid arteries ; vj, jugular veins ; as, subclavian artery ; vs, subclavian veins ; t, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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