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Updated: June 25, 2025
All the veins of the body, except those from the lungs and the heart itself, unite into two large veins, as already described, which pour their contents into the right auricle of the heart, and thus the grand round of circulation is continually maintained. This is called the systemic circulation. The whole circuit of the blood is thus divided into two portions, very distinct from each other.
All the cavities of the heart are lined with a smooth, delicate membrane, called the endocardium. Semilunar valves. 2. Tricuspid valve. 3. Mitral valve. 4. Right auricle. 5. Left auricle. 6. Right ventricle. 7. Left ventricle. 8. Chordæ tendineæ. 9. Inferior vena cava. 10. Superior vena cava. 11. Pulmonary artery. 12. Aorta. 13. Pulmonary veins.
Here the sac, which is situated at the base of the heart, and is the part analogous to the auricle in man, plainly forces the blood into the heart, and the heart, in its turn, conspicuously transmits it by a pipe or artery, or vessel analogous to an artery; these are facts which are confirmed by simple ocular inspection, as well as by a division of the vessel, when the blood is seen to be projected by each pulsation of the heart.
But in some of the pale-blooded and colder animals, as in snails, whelks, shrimps, and shell-fish, there is a part which pulsates, a kind of vesicle or auricle without a heart, slowly, indeed, and not to be perceived except in the warmer season of the year.
The bayonet entered the ventricle about 1 1/2 inches from the left apex, traversing the left wall obliquely, and making exit close to the septum ventriculorum. Roberts mentions a man who ran 60 yards and lived one hour after being shot through both lungs and the right auricle.
"Go a little further in your analysis; say, 'I love you with the right ventricle of my heart, but not the left, and with the left auricle of my heart, but not the right; and, this being the case, my affection for you is not of a duly elevated, intellectual and spiritual nature. I like you when you get philosophical." She looked quietly at him; he was trying to turn her own weapons against her.
Besides this, however, I have occasionally observed, after the heart and even its right auricle had ceased pulsating, when it was in articulo mortis in short, that an obscure motion, an undulation or palpitation, remained in the blood itself, which was contained in the right auricle, this being apparent so long as it was imbued with heat and spirit.
The superior vena cava receives blood from the head and the upper extremities; the inferior vena cava, from the trunk and the lower extremities; and the coronary veins, from the heart itself. With the left auricle, the four pulmonary veins. These receive blood from the lungs and empty it into the left auricle. With the right ventricle, the pulmonary artery.
At the entrance to the pulmonary artery are shown two of the pockets of the valve, the third pocket having been cut away with the front side of the artery. Starting from the great vein trunk, the vena cava, it pours into the receiving chamber, or auricle, of the right side of the heart, passes between the valves of the opening into the lower chamber, the right ventricle.
In like manner, wherever the heart has a single ventricle, there is an auricle appended, flaccid, membranous, hollow, filled with blood; and where there are two ventricles, there are likewise two auricles.
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