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Updated: May 20, 2025
On the other hand, the optic thalami, which lie between the latter, belong to the second division, which develops from the "intermediate brain "; to the same section belong the single third cerebral ventricle and the structures that are known as the corpora geniculata, the infundibulum, and the pineal gland.
But no one need remain in doubt of the fact, for if the ventricle be pierced the blood will be seen to be forcibly projected outwards upon each motion or pulsation when the heart is tense.
One striking embryonic character of the Amniotes is the great curve of the head and neck in the embryo. We also find an advance in the structure of several of the internal organs of the Amniotes which raises them above the highest of the anamnia. In particular, a partition is formed in the simple ventricle of the heart, dividing into right and left chambers.
In this way they cause the intermittent flow from, the heart to become a steady stream in the capillaries. The swelling of the arteries at each contraction of the ventricle is easily felt at certain places in the body, such as the wrist. This expansion, known as the "pulse," is the chief means employed by the physician in determining the force and rapidity of the heart’s action.
And further, inasmuch as the more perfect animals require a still more perfect nutrition, and a larger supply of native heat, in order that the aliment may be thoroughly concocted and acquire the last degree of perfection, they required both lungs and a second ventricle, which should force the nutritive fluid through them.
Of course, like any valvular lesion, it may be associated with other lesions, and sooner or later in many instances, when the left ventricle becomes dilated or weakened, mitral insufficiency also occurs.
He had brooded so long now, for months, and as yet had found no solution. And finally, in a form of religious despair, sitting at his desk, in his business chair, he had collapsed a weary and disconsolate man of seventy. A lesion of the left ventricle was the immediate physical cause, although brooding over Aileen was in part the mental one.
On the other hand, with a failing left ventricle and a long previous use of tobacco, it is no time to prohibit its use absolutely. A failing heart and the sudden stoppage of tobacco may prove a serious combination. This lesion, though not so common as the mitral lesion, is of not infrequent occurrence in children and young adults as a sequence of acute rheumatic endocarditis.
Sometimes simple hypertrophy of the left ventricle occurs from various kinds of conditions that increase the peripheral circulation. It may occur from oversmoking, from the mertisc of coffee aid tea, from certain kinds of physical labor, or from high tension mental work. It is a part of the story of hypertension.
Thornhill had finished his examination and would like to see them. He came in with a somewhat dissatisfied air, sat down heavily in the chair the inspector pushed forward for him, and said in a dissatisfied tone: "The blade pierced the left ventricle, about the middle, a good inch and a half. Death was practically instantaneous, of course." "I took it that it must have been.
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