Note 88 — Chapter VI · OF THE INFLUENCE OF THE DEATH OF THE LUNGS OVER THAT OF THE HEART.
F. Gold translation
As the blood flows in the veins in a continuous motion, the distension of these vessels does not take place in the direct motion of the blood, but in its retrograde motion. Every time the right auricle contracts, a portion of blood, instead of passing into the ventricle of the same side, is forced back into the superior and inferior venæ cavæ, and into the principal venous trunks which open into them. By this reflux of the blood, these veins are dilated, and have a pulsation which is easily seen in the jugular in very thin people. This pulsation has received the name of the venous pulse. When it is very evident, it may indicate an obstacle to the passage of the blood from the auricle to the right ventricle.
Another reflux of the blood in the veins corresponds with the moment of expiration, and is perceptible even longer. We shall soon have to speak of it, in speaking of the movements of the brain.