First lines of physiology / by Albert von Haller ; translated from the third Latin edition ; to which is added, a translation of the index, composed for the Edinburgh edition, printed under the inspection of Dr. William Cullen.

  • Haller, Albrecht von, 1708-1777.
Date:
1803
Catalogue details

Licence: Public Domain Mark

Credit: First lines of physiology / by Albert von Haller ; translated from the third Latin edition ; to which is added, a translation of the index, composed for the Edinburgh edition, printed under the inspection of Dr. William Cullen. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    for fome contiguous mufcle,by its preffure, to free the valve, and propel the column. This is the rca- fon for the iituation of valves in the veins of the limbs and neck; in which parts they are both more numerous and more robuft thanelfewhere. This alio explains the caufe of varices, when the blood, enter- in the valves, preifes their folid convexity down- wards, and forces them to defcend and dilate. Like- wife, in mufcuiar motion, the valves occafion the whole preffure which the veins then fuftain, to for- ward the due courfe of the blood towards the heart. i.x v.-Moreover,the valves placed in the right iide of the heart, are fo conftruded, as we mall here- after fee, that they freely permit blood, air, or wax, to pafs from the venous trunks of the cava into the heart, but allow nothing to efcape from the heart. lxvi. Befides,in a living perfon, ligatures make the thing evident. When either by defign or ac- cident, the veins of the ham, arm, or leg, are tied with the limb itfelf, the limb every where below the ligature fwells, the veins become diftended and turgid, and, when opened, freely difcharge blood; nothing of this kind happens above the ligature, nor are any veins to be feen there. The fame hap- pens when the veins are compreifed by fchirrous vifcera, or enlarged glans; and from polypi, tumors of the large veins are frequent. Ligatures retain the blood in any limb round which they are tied, and prevent it from returning to the heart, and from being loft through a wound in another parr. lxvii. The experiments which have been made on living animals, are ftill more accurate. From them,even from our own, it appears,that, by tying, in a living animal, any vein, whether belonging to the cava or to the pulmonary veins, that part al- ways fwells which is moft remote fromthe heart,and is diltended with the blood retained by the obftacle, while that next the heart becomes pale and flaccid. Laftly, if both the arteries and veins be tied, the veins