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Show a lateral section of a larynx to a trumpet or horn player and he will at once recognize its similarity to the cupped mouthpiece and tube of trumpet or horn, the cup in the larynx being formed by the ventricles or pockets above the vocal cords.
It is a most difficult thing for the spirits to be in a good plight, serene and lively, when there is nothing in the body but a kind of voidness and inanity; seeing the philosophers with the physicians jointly affirm that the spirits which are styled animal spring from, and have their constant practice in and through the arterial blood, refined and purified to the life within the admirable net which, wonderfully framed, lieth under the ventricles and tunnels of the brain.
The two lower chambers are called ventricles, and their walls form the chief portion of the muscular substance of the organ. There are, therefore, the right and left auricles, with their thin, soft walls, and the right and left ventricles, with their thick and strong walls. The Valves of the Heart.
Lavender mentions an incised wound of the heart penetrating the right ventricle, from which the patient recovered. Purple gives, an account of a recovery from a wound penetrating both ventricles. The diagnosis was confirmed by a necropsy nine years thereafter. Stoll records a nonfatal injury to the heart.
It was the cause of the heart-beat and the source of the innate heat of the body, and it maintained the processes of digestion and nutrition. This was the vital spirit; the animal spirit was elaborated in the brain, chiefly in the ventricles, and sent by the nerves to all parts of the body, endowing the individual with life and perception and motion.
It is perhaps generally auricular disturbance that causes pain to ascend, but disturbances of the ventricles can cause pain in the arms and in the region of the stomach. Not infrequently disturbances of the aorta cause pain over the right side of the chest as well as tip into the neck.
Q. Why do such as are apoplectic sneeze, that is, such as are subject easily to bleed? A. Because the passages, or ventricles of the brain are stopped, and if they could sneeze, their apoplexy would be loosed. Q. Why does the heat of the sun provoke sneezing, and not the heat of the fire?
But after many difficulties he made the following statements: first, that the heart is erected and raises itself up into an apex, and at this time strikes against the breast and the pulse is felt externally; secondly, that it is contracted every-way, but more so at the sides; and thirdly, that grasped in the hand it was felt to become harder at the time of its motion; from all of which actions Harvey drew the very natural conclusion that the activity of the heart consisted in a contraction of its fibres by which it expelled the blood from the ventricles.
This is certain, that it is in the head, since the head is the seat where the understanding thinks, and the will intends; and in front in the face of the head are man's five sensories, receiving life from the soul alone which resides in the head; but in what particular part of the head the soul has its more immediate residence, I dare not take upon me to say; yet I agree with those who fix its abode in the three ventricles of the brain, sometimes inclining to the opinion of those who fix it in the corpora striata therein, sometimes to theirs who fix it in the medullary substance of each brain, sometimes to theirs who fix it in the cortical substance, and sometimes to theirs who fix it in the dura mater; for arguments, and those too of weight, have not been wanting in the support of each of these opinions.
The sudden air pressure exerted on the interior walls of the larynx by the expiratory contraction causes the ventricles of the larynx to expand by inflation. This inflation of the ventricles brings their upper margins, formed by the false vocal cords, into contact. Thus the opening from the larynx into the pharynx is closed.
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