. Diseases of the dog and their treatment. the left lung and heart to the right side. There wassevere dyspnoea and anasarca. DISEASES OF THE CIRCULATORY APPARATUS. EXAMINATION OF THE CIRCULATORY APPARATUS. Examination of the Heart. Anatomy of the Heart.—The normal position of the heart maybe seen in Fig. GG. It lies on the left side, but not so far as is seen inother domestic animals. The direction of its axis is not vertical, l)utextends slightly in a posterior direction, with a slight curve toward theleft side. The base of the heart extends from the third to the seventhrib; the apex extends
. Diseases of the dog and their treatment. the left lung and heart to the right side. There wassevere dyspnoea and anasarca. DISEASES OF THE CIRCULATORY APPARATUS. EXAMINATION OF THE CIRCULATORY APPARATUS. Examination of the Heart. Anatomy of the Heart.—The normal position of the heart maybe seen in Fig. GG. It lies on the left side, but not so far as is seen inother domestic animals. The direction of its axis is not vertical, l)utextends slightly in a posterior direction, with a slight curve toward theleft side. The base of the heart extends from the third to the seventhrib; the apex extends backward toward the diaphragm. Superiorly theheart lies close to the large vessels—the trachea and the oesoi3hagus—and close on all sides to the lobes of the lungs. In its inferior portion itlies close to the chest-wall, extending from the third to the seventh ril).In the heart-sections we find the following arrangement: the rightsection lies in a right anterior direction from its axis and the left liesin a left posterior Fig. 66.—The heart in position: a. Right ventricle; b, left ventricle; c, left .auricle; d, right auricle;/,pulmonary artery; g, aorta; k, cesophagus; /, diaphragm. The size of the heart varies greatly in different animals, even whenin a normal condition, and it is, therefore, impossible to lay down anyrelative rule as to its size or dimensions. According to Colan, the weightof the heart compared with that of the body is 1 to 90; and according to 154 POSITlOX AXD SIZE OF THE HEART 155 Rabe, it varies from 1 to 40 to 100, and taking relatively all the breedsof dogs, and also of sex and age, the relative size is and to 100. It is difficult to make an examination of the heart on account of itsposition, lying as it does hidden between the lobes of the lungs, with onlya small portion of its surface exposed where it can be heard, and fromthe fact that it varies in size not only in the various breeds, but also inindividuals. We find that i
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