Heart

(hart). The organ giving the initiative and chief impulse to the circulation of the blood. It is enveloped by a membranous ti ue called the pericardium. It consists e entially of four cavities, a right auricle and ventricle, and a left auricle and ventricle. The movements of the heart may be recorded by means of the cardiograph, and these tracings, or cardiograms, may be of value in the study of diseased conditions. H., Dilatation of, the abnormal increase in size of any or all of the cavities of the heart. H. -burn, a burning feeling at the epigastrium and lower part of the chest, caused by the acetic or putrefactive fermentation of the gastric contents. H.clot, coagulation of the blood in the cardiac cavities; iac thrombosis. H. -disease, any functional or pathologic condition of the heart. H., Fatty, name given to two distinct pathologic conditions of be heart-ti ue. In the first there is a true fatty desneration of the muscular fibers of the heart; and in le second there is an increase in the quantity of sub car dial fat— a fatty infiltration. The former and avity of right auricle 2. Appendix auriculae. 3. Superior na cava. 4. Inferior vena cava. 5. Fo a oval is; the rominent ridge surrounding it is the annulus oval is. 6. eustachian valve. 7. Opening of the coronary vein. 8. Coronary valve. 9. Entrance of the auriculo-ventricular opening. Between the figures 1 and 9, several foramina thebes i i are seen. a. Right ventricle. 6, c. Cavity of right ventricle e,f. Tricuspid valve, g. Long column a carnea. k. The "long moderator band." i. The two columnae carneae of the right curtain, k. Attachment of chordae tendineaeof the left limb of the anterior curtain. Chordae tendineae of the " fixed curtain " of the valve, m. Valve of the pulmonary artery. Apex of left appendix auriculae. o. Left ventricle. Ascending aorta, q. Its transverse r. Descending aorta. most serious condition is due to a deficiency in the supply of oxygenated blood to the heart, arising either from local or general causes. It gives rise to asthma, angina pectoris, and a tendency to syncope and sudden death. The second condition is usually a ociated with general obesity, and may present the same symptoms as the first. H. -hurry, Paroxysmal. See Tachycardia . H., Hypertrophy of, an abnormal increase in the muscular ti ue of the heart. See, Horizontal Section of Lungs and Heart. 1. Upper lobes of lungs. 2, 2. Lower lobes. 3 Dorsal vertebra.