On the Function of the Circle of Willis
نویسنده
چکیده
published his "Cerebri Anatome," in which he described, at the base of the brain, the arterial anastomosis which since then has borne his name. In this book, there is a very interesting description of an experiment? Carotidiek Arteries be laid bare on either side of the Cervix or the hinder part of the Head, so that their little Tubes' or Pipes, about half an inch long, may be exhibited together to the sight; then let a dyed liquor, and contained in a large Squirt or Pipe, be injected upwards in the trunk of one side, after once or twice injecting, you shall see the tincture or dyed liquor to descend from, the other side by the trunk of the opposite Artery: yea, if the same be more copiously injected towards the Hea& from thence returning through the Artery of the opposite side, it will go thorow below the Praecordia, even to the lower Region of the Body; when in the meantime, little or nothing of the same tincture is carried thorow the outward and greater Jugular Veins. Then the Head being opened, all the Arteries, before the entrance of the Head, and the Veins of the same band with them~ will be imbued with the color of the same injected liquor. Further, in the Vessels which constitute the wonderful Net, and which cover the Basis of the Brain, some footsteps of the same tincture will appear. But that this liquor doth descend so plenfiful,ly by the opposite Artery, and not by the Jugular Vein, either associate or opposite, the reason is, because it cannot enter those Veins, unless the region of the whole Brain, being first passed thorow, it had entered the bosom; but the liquor being plentifully injected, could not so suddenly pass thorow the very small Vessels covering the Brain: wherefore rather than the force should be carried to the Brain by the violent impulse of the liquor, it returning from the injection, and otherwise threatening a flood to the Brain, finds the way of receding also by the opposite Arteries, for that end, both before they enter the Brain, and after they have entered it, eommunicating among themselves. "And here we cannot sufficiently ad~nire so provident (and to be equalled by no mechanical Art) a dispensation of the blood within the confines of the Brain. 348
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عنوان ژورنال:
- The Journal of Experimental Medicine
دوره 15 شماره
صفحات -
تاریخ انتشار 2003