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In the former, it is expanded and contracted through the pulmonary arteries and veins, which are from the heart alone; in the latter, through the bronchial arteries and veins, which are from the vena cava and aorta, and these vessels are outside of the heart.
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.
Below us, as we rapidly descend the slopes by the curves of the Corniche road, lies the little beach known as Lo Scaricotojo, whence in the days previous to the construction of this splendid highway all visitors were wont to embark for Amalfi;—that is, unless they attempted the expedition by way of the mountain roads leading thither from Castellamare or La Cava. It raises a smile in these days of swift and luxurious travelling to learn from an early Victorian guide-book that “the most elegible mode of going from Sorrento to Amalfi is either to ride or to be carried in a chaise
Since all things, both argument and ocular demonstration, show that the blood passes through the lungs, and heart by the force of the ventricles, and is sent for distribution to all parts of the body, where it makes its way into the veins and porosities of the flesh, and then flows by the veins from the circumference on every side to the centre, from the lesser to the greater veins, and is by them finally discharged into the vena cava and right auricle of the heart, and this in such a quantity or in such a flux and reflux thither by the arteries, hither by the veins, as cannot possibly be supplied by the ingesta, and is much greater than can be required for mere purposes of nutrition; it is absolutely necessary to conclude that the blood in the animal body is impelled in a circle, and is in a state of ceaseless motion; that this is the act or function which the heart performs by means of its pulse; and that it is the sole and only end of the motion and contraction of the heart.
The next morning they went to Pompeii, where in the late afternoon carriages were to meet them for beginning the drive through Castellammare, Sorrento, and Amalfi to La Cava.
Heart of a human embryo, eight weeks old, back view. a apostrophe left auricle, a double apostrophe right auricle, v apostrophe left ventricle, v double apostrophe right ventricle, cd apostrophe right superior vena cava, ci inferior vena cava.
But, talking of beauty, were you in the queen's pavilion last night, noble marquess? it was enriched by a new maiden, whose strange and sudden apparition none can account for. Her eyes would have eclipsed the fatal glance of Cava; and had I been Rodrigo, I might have lost a crown for her smile." They tell me the prince incurred the queen's grave rebuke for his attentions to the maiden."
And that we may have the less difficulty to understand what I shall say thereof, I wish those who are not versed in Anatomy, would take the pains, before they read this, to cause the heart of some great animal which hath lungs, to be dissected; for in all of them its very like that of a Man: and that they may have shewn them the two cels or concavities which are there: First that on the right side, whereto two large conduits answer, to wit, the vena cava, which is the principal receptacle of bloud, and as the body of a tree, whereof all the other veins of the body are branches; and the arterious vein, which was so mis-call'd, because that in effect its an artery, which taking its origine from the heart, divides it self after being come forth, into divers branches, which every way spred themselves through the lungs.
The noisy twittering of multitudes of ubiquitous sparrows, equally at home in Doric temples as amongst the sooty chimney stacks of London; the twinklings and rustlings of the lizards in the young leaves and grass; the polyglot babble of excursionists from Naples or La Cava that a warm day in Spring invariably attracts to Paestum:—these are not sounds that blend well with the solemn spirit of the place.
From this it will be understood that in the human embryo, and in the embryos of animals in which the communications are not closed, the same thing happens, namely, that the heart by its motion propels the blood by obvious and open passages from the vena cava into the aorta through the cavities of both the ventricles, the right one receiving the blood from the auricle, and propelling it by the pulmonary artery and its continuation, named the ductus arteriosus, into the aorta; the left, in like manner, charged by the contraction of its auricle, which has received its supply through the foramen ovale from the vena cava, contracting, and projecting the blood through the root of the aorta into the trunk of that vessel.
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