The elements of pathology / by Edward Rindfleisch ; translated from the 1st German ed., by Wm. H. Mercur ; revised by James Tyson.

  • Rindfleisch, Georg Eduard von, 1836-1908.
Date:
1885
Catalogue details

Licence: Public Domain Mark

Credit: The elements of pathology / by Edward Rindfleisch ; translated from the 1st German ed., by Wm. H. Mercur ; revised by James Tyson. Source: Wellcome Collection.

    30/274 (page 22)
    to the blood pressure, the clilatatioii aud hyperseraizatioii of the circulation. The process may easily be followed under the mieroscope; best of all in the mesentery of a living curarized trog, which has been carefully stretched over a cork ring. In ten or fifleen minutes after the Operation, the widening of the blood vesseh begins. This reaches its maximura in one or two hours, and continues so during the entire process. Two liours later the dilatation is followed by a perceptible slowLng of the blood current. When we consider that no obstacle is oftered by the veins to the flow of blood, and that the arteries do not hinder the blood from coursing,as in arterial hypersemia, more swiftly through the enlarged capillaries, we raust regard this retarded flow as an especially characteristic mark of inflararaatory hypersemia. The slowing of the blood current can lead to a temporary or even complete blood stoppage (stasis). The local dilatation of the blood vessels is not a sufficient explanation of this pro- ceeding. Local dilatation of the blood vessels also occurs in arterial hypersemia, which, of itself, does not retard the flow in a smaller blood vessel. We must, therefore, revert again to the alterations in the blood vessel walls. It is this factor which changes the whole power of dilfusibility between the blood and parenchynia into a heightened exosmotic current. With a force foreign to normal uutrition, all the blood par- ticles are drawn toward the blood ve.ssel wall, aud thus, among other things, the velocity of their forward movement is diminished. I say “among other things,” because inflamma- tory exudation is a far-reaching and important rcsult of abnormal exosmosis. (c) InflammATORY Exubation.—By inflammatory exuda- tion we understaud the escape of the constituents of the blood from the blood vessels of the inflamed tissues and paren- cliyma. The visible rcsult is either an infiltration of the parenchyma with the escaped material, or external discharges. All exudates are cornposed of different constituents of the blood, such a.s salt, water, albumen, fibrinoplastic substance, and blood corpuscles. In proportion as an exudate contains more of one or the other ot the above named substances, it is called serous, fibrinous, corpuscular or hemorrhagic. The serotut exudate is closely allied in composition to die normal nutritive Juices, except that the latter, while uutrition