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Updated: June 21, 2025
He attained to some knowledge of the ventricles of the brain, the cranial and spinal nerves, the nerves of the heart, and the coats of the eye. Being fixed down behind the abdominal cavity it cannot be further convoluted, and this accounts for Galen's description of it. It is about twelve fingers' breadth long in the animals dissected by Herophilus.
It crossed the wall of the valve of the heart, which was very thin in this place. The size of the heart was very small, considering the height and bulk of the dog. The walls of the ventricles, and particularly of the left ventricle, were very thick.
The ventricles, having in this way been fully charged by the auricles, now contract and force their contents into the large arteries. *Sounds of the Heart.*—Two distinct sounds are given out by the heart as it pumps the blood. One of them is a dull and rather heavy sound, while the other is a short, sharp sound.
Lest you should think it is not so, be pleased but to contemplate a little the form, fashion, and carriage of a man exceeding earnestly set upon some learned meditation, and deeply plunged therein, and you shall see how all the arteries of his brains are stretched forth and bent like the string of a crossbow, the more promptly, dexterously, and copiously to suppeditate, furnish, and supply him with store of spirits sufficient to replenish and fill up the ventricles, seats, tunnels, mansions, receptacles, and cellules of the common sense, of the imagination, apprehension, and fancy, of the ratiocination, arguing, and resolution, as likewise of the memory, recordation, and remembrance; and with great alacrity, nimbleness, and agility to run, pass, and course from the one to the other, through those pipes, windings, and conduits which to skilful anatomists are perceivable at the end of the wonderful net where all the arteries close in a terminating point; which arteries, taking their rise and origin from the left capsule of the heart, bring through several circuits, ambages, and anfractuosities, the vital, to subtilize and refine them to the ethereal purity of animal spirits.
Vesalius accepted Galen's view that there is some communication between the venous and arterial systems through pores in the septum of the ventricles, though he had his doubts, and in the second edition of his book says that inspite of the authority of the Prince of Physicians he cannot see how the smallest quantity of blood could be transmitted through so dense a muscular septum. II. Ed.
But what seemed the most conclusive proof of all was the fact that in the foetus there existed a demonstrable opening between the two ventricles, and yet this is closed in the fully developed heart. Why should Nature, if she intended that blood should pass between the two cavities, choose to close this opening and substitute microscopic openings in place of it?
The complication of the organ increases; cavities, termed ventricles, are formed, which do not exist in fishes, reptiles, or birds; curiously organized parts, such as the corpora striata, are added; it is now the brain of the mammalia. Its last and final change alone seems wanting, that which shall render it the brain of man." pp. 150-152.
I have seen and talked with such; and they said that they have one life, and are like the life of good in truth and the life of truth in good, and are like the pairs in man, that is, like the two hemispheres of the brain enclosed in one membrane, the two ventricles of the heart within a common covering, likewise the two lobes of the lungs; these, although they are two, yet are one in regard to life and the activities of life, which are uses.
These were the first four fundamental facts which really opened the way for the discovery of the circulation, as it did away with the belief that the heart in its motion attracts blood into the ventricles, stating on the contrary that by its contraction it expelled the blood and only received it during its period of repose or relaxation.
How any one with even a slight understanding of mechanics could imagine the checking of the breath by the inflation of the ventricles of Morgagni, is hard to conceive. The Psychology of Tone-Production At the risk of some repetition it is therefore advisable here to sum up the laws of psychology bearing on the vocal action.
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