The last section of the venous system to be dealt with is that of the anterior abdominal vein.
During the second day these venous trunks join the body of the embryo considerably in front of, that is nearer, the head than the corresponding arterial ones.
There is a main venous ring in the thickened edge of the blastoderm, which is connected with the embryo by a single stem running along the seam where the edges of the blastoderm have coalesced.
A venous system of returning vessels is now fully developed, and its relations are very remarkable.
F), and eventually fall into the general uterinevenous system.
The venous system of Birds and Mammals differs in two important points from that of Reptilia and Amphibia.
There is then present a single arterial and a single venous trunk.
At a still later stage the arterial ring embraces the whole yolk, and, as a result of this, vanishes in its turn, as did the venous ring before it.
The rest of the blood brought by the vitelline arteries finds its way into the lateral portions of a venous trunk bounding the vascular area, which is known as the sinus terminalis, S.
As soon as sensation is reduced the motor and sensory circuit is completed and the labor of the artery is less, because of venous resistance having been removed.
The circuit of electricity is complete as proven by the completed arterial and venous circuit for the reduction of motor irritation.
Abnormal vasodilatation seriously interferes with the normal circulation, and causes venous congestion, abnormal increase in venous blood pressure, and the consequent danger of shock and death.
Effect of Change of Posture--Without Active Muscular Exertion--on the Arterial and Venous Pressures, Arch.
A quick method of estimating the venous pressure by lowering and raising the arm has long been utilized.
He also finds that with an increase of venous pressure the urinary output decreases.
It should be remembered that just before death venous pressure is likely to rise, and this may raise the diastolic pressure.
If there is considerable venous congestion there may be more or less frequent recurrent venous hemorrhages.
Alarmed by the sudden suffusion of venousblood on his face and neck, the reddish glow of his eye, she forged hasty excuses.
Putrefactive changes begin very soon after death, and the liver and other viscera, owing to their soft texture and to the quantity of venous blood they retain, advance rapidly in decomposition.
It should be remembered, however, that these flavoring matters are chiefly excrementitious or waste substances, derived from thevenous blood of the animal.
This leaves the blood-vessels belonging to the portal circulation distended with venous blood, which putrefies very quickly, forming a virulent poison.
The menorrhagia, or continued flow of this discharge, is owing to a continued defect of the venous absorption of the membranes of the uterus or vagina.
Sea-scurvy is caused by salt diet, the perpetual stimulus of which debilitates the venous and absorbent systems.
A bleeding from the capillaries arising from defect of venous absorption, as in some of those fevers commonly termed putrid.
Its cause is nevertheless at present very obscure, since a temporary deficiency of venous absorption, at the extremities of the pulmonary or bronchial veins, might occasion a similar difficulty of respiration.
In other cases the lochia continues too long, or in too great quantity, owing to the deficiency of venous absorption.
Hence its efficacy in restraining hæmorrhages, after the vessels are emptied, by promoting venous absorption.
If the beginnings or absorbent mouths of the venous system remain torpid, petechiæ or vibices are produced in fevers, similar to those which are seen in scurvy without fever.
When vinegar is applied to the lips, it renders them instantly pale, by promoting the venous absorption; if the whole skin was moistened with warmish vinegar, would this promote venous absorption in the lungs by their sympathy with the skin?
Venous hæmoptoe frequently attends the beginning of the hereditary consumptions of dark-eyed people; and in others, whose lungs have too little irritability.
It is a new growth, consisting of a variable hypertrophy of the cutaneous and subcutaneous arterial and venous bloodvessels, with or without an increase of the connective tissue.
It is an actual fact that blood from which all the oxygen has been withdrawn is so much darker than ordinary venous blood that it gives the impression of being black, although it is really a dark purple.
Arterial blood ordinarily carries practically all the oxygen it is able to take up; venous blood on the other hand probably never comes anywhere near being as fully charged with carbon dioxide as it is able to be.
The color of venous blood will be darker than that of arterial blood, because it contains a good deal less oxyhemoglobin, but it is nowhere near so dark as is blood in which all the oxyhemoglobin has been decomposed.
In brief, while passing through the capillaries of the lungs the blood has been changed from the venous to the arterial blood.
After the blood has been robbed of its bile-making materials, it is collected by the veinlets that surround the lobules, and finds its way with other venous blood into the hepatic vein.
A name given to the two great veins of the body which meet at the right auricle of the heart Venous (Lat.
These two great venous trunks are the inferior vena cava, bringing the blood from the trunk and the lower limbs, and the superior vena cava, bringing the blood from the head and the upper limbs.
These open by the right lymphatic duct into the venous system on the right side of the neck.
This is the change from the arterial to venous conditions which has been described in the preceding chapter.
Here the dark venous blood, loaded with effete material, lays down its carbon burden and, with the brightening company of oxygen, begins again its circuit.
The blood thus becomes purified and reinvigorated, and at the same time is changed in color from purple to scarlet, from venous to arterial.
These two veins bring venous blood from all parts of the body, and pour it into the right auricle, whence it passes into the right ventricle.
The impure, venous blood here gives up its débris in the shape of carbon dioxid and water, and in return takes up a large amount of oxygen.
The student must guard himself against the idea that arterial blood contains no carbonic acid, and venous blood no oxygen.
In passing through the lungsvenous blood loses only a part of its carbonic acid; and arterial blood, in passing through the tissues, loses only a part of its oxygen.
From this tissue activity, which is mainly oxidation, are formed certain waste products which, as we have seen, are absorbed by the capillaries and lymphatics and carried into the venous circulation.
Thus the pulmonary artery carries venous blood from the right ventricle to the lungs, as the pulmonary veins carry arterial blood from the lungs to the left auricle.
They obstruct the local venous circulation and are a fruitful source of cold feet and of enlarged or varicose veins.
Now, as we have seen, the change from venous to arterial blood occurs in the capillaries of the lungs, the only means of communication between the pulmonary arteries and the pulmonary veins.
That this living principle vivifies the liver and the venoussystem generally; 3.
This occurred so often as to lead us to think there could not always be an arterial reaction occasioning the effusion, and that this effect arose from the mere obstruction to the venous circulation.
In the same number of the Medical Week, Professor Gréhant states that after injecting a quantity of alcohol into the venous circulation of a dog equal to one twenty-fifth, or four per cent.
Must it not impede the motion of the venous blood in its return to the heart?
It receives also a large amount ofvenous blood, which is distributed through its substance by a separate set of vessels, derived from the venous system.
In the early or mild forms, it consists of congestion in the veins or venous radicles, and effusions into the cellular tissue.
The process of converting venous blood into arterial blood during its passage through the lungs, oxygen being absorbed and carbonic acid evolved; Ð called also aration and hematosis.
One of the vessels or tubes which carry either venous or arterial blood from the heart.
The pulmonary artery conveys the venous blood from the right ventricle to the lungs, whence the arterialized blood is returned through the pulmonary veins.
To transform, as the venous blood, into arterial blood by exposure to oxygen in the lungs; to make arterial.
Of the two kinds of blood, the one, contained in the venous system, was dark and thick and rich in grosser elements, and served for the general nutrition of the body.
Apparently his view was that there was a sort of ebb and flow in both systems--and yet, he uses language just such as we would, speaking of the venous system as ".
On each side of the middle line of the ventral surface of the body a large longitudinal venous sinus exists, called by Milne-Edwards the venous collecting sinus, L.
Precisely the same arrangement of veno-pericardial muscles and of longitudinal venous collecting sinuses occurs in the scorpions.
Single cells of the same sort are found along the whole course of the branchialvenous canal, right up to the pericardium.
The heart is surrounded by a pericardium, from which at regular intervals a number of dorso-ventral muscles pass, to be inserted into the longitudinal venous sinus on each side.
A tube thus formed from the grooved ventral surface would carry with it to the new ventral surface the longitudinal venous sinuses, and thus form, in the way already suggested, the heart and ventral aorta.
The other, like the venous blood, flows from the circumference towards the centre: this is the solar heat which the earth continues to receive through its crust.
The ascending sap, after undergoing an important modification in the leaves, becomes the descending sap; just as the venous blood is transformed, on coming into contact with the air in the lungs, into arterial blood.
In the turtle it is so nearly complete that the venous and the arterial blood are fairly separated; in the crocodile it is quite complete, though the arteries are imperfectly arranged.
White were doing a cutdown, venous section using polyethylene catheters through which fluid, medicine and blood could be administered.
Ronald Jones was doing an additional cut down, venous section on the left arm for the insertion of plastic cannula into veins so one may rapidly and effectively infuse blood and fluids.
The moist tissues suffuse carbonized blood, and there occurs an osmotic interchange between the carbon dioxid and the oxygen of the air resulting in an oxygenation of the blood, and modification of the color from dark venous to arterial red.
Parvin gives portraits showing the venous congestion and discoloration of the lips.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "venous" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: arterial; capillary; vesicular
