The cavity of this ventricle is of small size in the living head, for the inner surfaces of the two thalami are connected together by intermediate grey matter, named the middle or soft commissure.
This lining is continuous through the foramen of Monro with that of the third ventricle, which again is continuous with the lining of the fourth ventricle through the aqueduct of Sylvius.
If a section is made transversely through the medulla about the apex of the fourth ventricle three important bundles of fibres are cut close to the mid line on each side (see fig.
The floor of the third ventricle is developed from the basal laminae, which here are not very important and from which the tuber cinereum and, until the fourth month, single corpus mammillare are developed.
The original anterior vesicle from which the hemispheres evaginate is composed, as already shown, of an anterior part or telencephalon and a posterior or thalamencephalon; the whole forming the third ventricle in the adult.
When the fourth ventricle is reached they diverge to form the lower limit of that diamond-shaped space and are slightly swollen to form the clavae.
To show the Right Ventricle and the left half of the Corpus Callosum.
The grey matter in the interior of the medulla appears, therefore, on the floor of the ventricleand is continuous with the grey matter near the central canal of the cord.
The floor of the fourth ventricle is of special interest because a little way from the surface are the deep origins of all the cranial nerves from the fifth to the twelfth.
The roof of the fourth ventricle widens out very much and remains largely epithelial as the superior and inferior medullary vela.
The lateral ventricle is lined by a ciliated epithelium called the ependyma.
Caecal tubes or pouches: sac, or blind tube-like structures surrounding the chylific ventricle at its junction with the crop, and secreting a digestive ferment.
Hind-gut: the intestinal canal from the end of chylific ventricle to the Anus, including the malpighian tubules and anal glands.
Gastro-ileal folds: occur in some insects at the junction of the chylific ventriclewith the ileum and serve as a valve.
Gizzard: a pouch-like structure between the crop and chylific ventricle furnished with chitinous teeth or plates, in which the food is prepared for the digestive juices by grinding or merely sifting = cardia.
Ileum: the small intestine; begins at end of chylific ventricle at the point where malpighian tubules join, and extends to colon.
The "third ventricle is the cerebellum, by which the brain is connected with the spinal marrow and the rest of the body; the memory is posted in the cerebellum, like a warder or sentinel, to warn the reason against attack.
Trace the blood from the right ventricle to the alveoli and back again to the left auricle.
The pressure maintained by the left ventricle has been estimated to be nearly three and one half pounds to the square inch—a pressure sufficient to sustain a column of water eight feet high.
To distinguish these cavities further, they are named from their positions the right auricle and the left auricle, and the right ventricle and the left ventricle (Fig.
The valve between the right auricle and the right ventricle is called the tricuspid valve.
It is suspended from a thin ring of connective tissue which surrounds the opening, and its free margins extend into the ventricle (Fig.
The pressure maintained by the rightventricle is about one third as great.
The swelling of the arteries at each contraction of the ventricle is easily felt at certain places in the body, such as the wrist.
By the former the blood passes from the rightventricle through the lungs, and is then returned to the left auricle; by the latter it passes from the left ventricle through all parts of the body, returning to the right auricle.
The walls of the ventricles are much thicker and stronger than those of the auricles, while the walls of the left ventricle are two or three times thicker than those of the right.
This starts at the right ventricle and by its branches conveys blood to the capillaries surrounding the alveoli in all parts of the lungs.
The left semilunar valve is around the opening of the left ventricle into the aorta, and is similar in all respects to the right semilunar valve.
A valve is found at the opening of each auricle into the ventricle, and at the opening of each ventricle into the artery with which it is connected.
What action of the ventricle is represented by compressing the bulb?
Cut off the end of the left ventricle about an inch above the apex.
The right ventricle forces the blood through the lungs and into the left auricle.
The leftventricle sends its charge into the aorta and through this by the arteries to the body at large.
The septum so called because it separateth the right ventricle from the left, is that thick and fleshy substance set between the two cavities.
The next chapter is devoted to the description of the manner in which the blood passes through the substance of the lungs from the right ventricle of the heart into the pulmonary veins.
First, that the vital spirit may be thrust from the leftventricle of the heart into the aorta.
This laceration had apparently been caused by an impediment to the passage of the blood from the left ventricle into the arteries.
It is very common to find the left ventricle contracted and hard, while the right is uncontracted.
I have invariably found the heart full on the right side; very generally the left ventricle firmly contracted, and the blood usually dark, and often fluid.
With the beating of the heart, described below, it is forced into the right ventricle and from there through the pulmonary artery (p.
The singleventricle is blocked with bars of tissue that render its interior, not an open cavity, but a spongy mass.
Figure by the heart, passes thence to the thick-walled left ventricle (l.
The spongy nature of the ventriclesufficiently retards this mixing.
The merit of these distinctions, however, he afterwards destroys by repeating the old assertion that the left ventricle ought to contain spirit or air, which it generates from the blood.
Representing the left ventricle of the heart as the common origin of all the arteries, though he is misled by the pulmonary artery, he nevertheless traces the distribution of the branches of the aorta with some accuracy.
Some of the best examples of simple hypertrophy of the left ventricle are found under such circumstances.
This is equivalent to saying that every systole of the left ventricle distends this artery by a sudden increase in pressure equal to the weight of a column of mercury 2 mm.
In the heart no murmurs were heard, and it was difficult to be sure that the left ventricle was enlarged.
Moreover, when the next regular stimulus comes from the s-a node it finds the ventricle in a refractory condition, having just ceased a contraction, and it is not until the next sinus impulse that the ventricle responds normally.
The right ventricledoes not appear to be much affected.
The hypertrophy of the left ventricle brings more of this portion of the heart toward the anterior chest wall.
The auricular contractions are so rapid that theventricle can not respond, so that an electrocardiagram of a heart in such a state (Fig.
The ventricle actually by measurement contains more blood than normal, and therefore throws out more blood at every systole.
The ventricle actually contains more blood when it is full, and throws out, therefore, more blood at each systole.
The heart was flaccid, the right auricle and ventricle were enlarged and attenuated, and both vena cava at their junction with the heart were much dilated, the valvular structure natural.
Both auricle and ventricle on the left side of the heart contained a deep-dark blood.
The substance of the heart, in all the cases, was soft and attenuated; the right auricle and ventricle were dilated; and there was thickening of several of the valves.
The right auricle and ventricle were dilated considerably.
The heart is usually found relaxed or the left ventricle contracted in systole, while the right is relaxed.
The middle ventricle was found filled with yellow serum, while the fourth ventricle contained a hemorrhagic effusion,[76] and the base of the brain was covered by a clot.
The left ventricle was contracted and the rest of the heart relaxed.
He describes a number of small pits, which really exist there, as holes, and he supposed that the greater part of the blood passed through these holes from the right to the left ventricle (Figure 2).
That the posterior cornu of the lateral ventricle is neither peculiar to, nor characteristic of, man, inasmuch as it also exists in the higher quadrumana.
The middle or inferior horn of each lateral ventricle of the brain.
A large transverse commissure in the third ventricle of the brain; the middle or soft commissure.
The left-side valve is the mitral valve, that between the right auricle and ventricle the tricuspid valve.
That of the rightventricle has been shown double for the sake of convenience.
Each ventricle has a second valve through which it ejects the blood.
Between each auricle and its ventricle is a valve, which consists of strong membranous flaps, with loose edges turned downwards.
Temporary mechanical substitution for the left ventricle in man.
The transference of the spiritus naturalis to the lungs, and its return to the left ventricle as spiritus vitalis, was the function which he regarded as important.
The heart is enclosed in the pericardium, and consists of a median elongated ventricle and a pair of lateral auricles, so that the structure somewhat resembles that in the Lamellibranchiata.
There is a heart in the pericardium consisting of a median ventricle attached, except in Neomenia, to the dorsal wall of the pericardium, and in Neomenia a pair of auricular ducts returning blood from the gills to the ventricle.
The ventricle leads into a single anterior median aorta.
The openings of the auricles into the ventricle vary in different forms.
Active cerebral congestion may be from hypertrophy of the left ventricle of the heart, excessive exertion, the influence of extreme heat, sudden and great excitement, artificial stimulants, etc.
Hypertrophy of the left ventricle alone increases its length; of the right ventricle alone increases its breadth toward the right side.
If the pulse is small and feeble at the jaw, we may conclude that there is some obstacle to the escape of the blood from the leftventricle into the aorta, which has given rise to the hypertrophy.
The Ventricle of their Heart contracts about sixty times in a minute; and the purple colour of the Blood which is seen within it, disappears after each contraction, or the Blood is entirely expelled by its contraction.
A heart lies within the median line of the body, and consists of a ventricle and two lateral auricles.
It has a median ventricle and two lateral auricles, each connected with the branchiae upon its respective side.
This ventricle then contracts in its turn, and the blood passes through another valve into the great aorta, to go the round of the circulation and return in the manner just described.
The left ventricle is smaller than the right, yet its walls are much thicker and stronger than those of the latter: it is from this part that the large trunk of the arteries proceed, called the great aorta.
In the higher vertebrates this septum becomes more and more specialized, separating auricle and ventricle into right and left cavities.
In the lowest of the fish-like forms, the lancelet, the eye is simply a minute pigment-spot situated in the anterior wall of the ventricleat the anterior end of the central nervous system.
Of these parts the ventricle is deepest in color and with thickest walls.
It contains one auricle and one ventricle only, not two of each as in man.
Hence it passes to the auricle and ventricle, and from the ventricle through the arterial bulb, or conus arteriosus to the ventral aorta.
The work which the right ventricle accomplishes is very much less than that of the left, and the right ventricle has a correspondingly thinner wall.
In such cases the ventricle must do more than in the first case.
When the ventricle empties by its contraction the wall relaxes and the back flow from the artery is prevented by crescentic-shaped valves placed where the artery joins the ventricle.
To him we owe the term hippocampus, and he described the fourth ventricle very accurately, calling it the cistern of the cerebellum.
This reservoir is often called the auricle, for it seems to act as an instrument of impulsion, and to drive the blood into the ventricle or heart, properly so called.
The chylific ventricle or stomach is never absent; it is the organ which performs the principal part in the act of digestion.
At the posterior extremity of the chylific ventricle are inserted a variable number of fine tubes, usually elongated and flexible, and terminating in culs-de-sac at one end.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ventricle" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: anatomy; botany; capsule; cerebellum; cerebrum; convolution; fissure; lobe; mantle; receptacle
