Copy 1

Outlines of human pathology / [Herbert Mayo].

  • Mayo, Herbert, 1796-1852.
Date:
1836
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of human pathology / [Herbert Mayo]. Source: Wellcome Collection.

    479/638 (page 443)
    through that branch will interfere with the formation of the clot in the vessel behind the ligature, on which the security of the cicatrix of the vessel depends. Hemorrhages which flow from rupture of inward vessels (in the lungs for instance) require other principles for their suppression. These are, rest, which keeps down the action of the heart, the promotion of (or the not interfering with) the faintness that supervenes, for that faintness disposes the blood to coagulate in and around the ruptured vessel: the use of inward styptics, such as Ruspini’s styptic, or the subace- tate of lead, or the acetate of zinc, which are thought to have a tendency when taken by the stomach into the system to cause the opened vessels to contract. When arterial hemorrhage is stopped by the application of a ligature on an artery, the following changes additionally take place. The ends of the artery, which was divided by the ligature, are united by a strong cord of coagulated lymph ; the cord of course is solid, not a tube: the ends which it joins, instead of communicating through it, become, in the lapse of a few months, shrunken and impervious for some distance from the place where the ligature was applied. The arterial tissue wastes by absorption on each side of the primary point of obliteration. As if nature anticipated the occasional obliteration of ar- terial trunks, there is a provision for supplying their place, This is founded on the same principle which determines their closure when divided ; namely, on their irritability : through this endowment on the one hand a torn artery may con- tract: on the other, the collateral arteries may become re- laxed and allow the blood to flow in fuller streams through them to the distal part of the limb. It is not indeed their _relaxation alone which accomplishes this etiect: the eftect begins in relaxation, but it is completed by growth. The collateral arteries, which at first give by relaxation, after- wards consentaneously grow to a larger dimension. The hemorrhagic tendency. There are persons who are in danger of bleeding to death from the slightest wound; and cases are on record, in which the amputation of a limb, the ‘emoval of a tumour from the rectum, the extraction of a yo ae ~