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The aorta sustains a more powerful shock from the left than the pulmonary artery does from the right ventricle, and the walls of this last vessel are thinner and softer than those of the aorta in the same proportion as the walls of the right ventricle of the heart are weaker and thinner than those of the left ventricle.
He stands alone among reptiles. His heart has two ventricles, and you would think that he ought to be included in the class of warm-blooded animals. But, no. The separation of the two kinds of blood takes place in the heart, it is true, and it is really true arterial blood which the aorta carries away from the left ventricle. But the right ventricle has two doors of exit.
The spermatic vessels in women, consist of two veins and two arteries, which differ from those of men only in size and the manner of their insertion; for the number of veins and arteries is the same as in men, the right vein issuing from the trunk of the hollow vein descending and besides them there are two arteries, which flow from the aorta.
And then, as the blood is incessantly flowing into the right ventricle of the heart, and is continually passed out from the left, as appears in like manner, and as is obvious, both to sense and reason, it is impossible that the blood can do otherwise than pass continually from the vena cava into the aorta.
The left recurrent nerve may be stretched or pressed upon as it hooks round the arch of the aorta, and hoarseness of the voice and a characteristic "brassy" cough may result from paralysis of the muscles of the larynx which it supplies. The vagus, the phrenic, and the spinal nerves may also be pressed upon.
Another common cause of arteriosclerosis occurring too early is the occurrence of some serious infection in a person, typhoid fever and sepsis being most frequent. Syphilis is a frequent cause, especially of that form of arteriosclerosis which shows the greatest amount of disease in the aorta.
And the air-ducts, which we said were channels for breath, embracing the bladder on either side in the region of the pelvis, are united at the great duct which is called the dorsal aorta. And thus the breath passing through the side doors towards the heart produces the movement of the embryo.
In a somewhat parched voice Tom started to explain how this could come about, but in no time he was talking gibberish. "The aorta," he heard himself saying, "is the big main artery which comes out of one of the ventricles," and then he noticed the dazed look on the men's faces and, floundering hopelessly, managed to laugh it off.
A great part of the army had passed before the surrender of the fort, which so completely commands the narrow valley leading to Aorta that it is difficult to comprehend the negligence of the Austrians in not throwing up more efficient works; by very simple precautions they might have rendered the passage of St. Bernard unavailing.
#Thoracic Aneurysm.# All varieties of aneurysm occur in the aorta, the fusiform being the most common, although a sacculated aneurysm frequently springs from a fusiform dilatation. The clinical features depend chiefly on the direction in which the aneurysm enlarges, and are not always well marked even when the sac is of considerable size.
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