Physiology and biochemistry in modern medicine . s same fact has been shown bySeelig and Joseph,27 who cut the vasomotor nerve proceeding to thevessels of one ear of a white rabbit and thus caused a local paralyticdilatation of the vessels. Intense shock was then produced in the animalin the usual way, after which the blood pressure in the anterior part ofthe animal was suddenly raised by applying a clamp to the abdominalaorta just below the This increased blood pressure causedthe vessels of the denervated ear to become engorged with blood, butnot those of the opposite normal ear,
Physiology and biochemistry in modern medicine . s same fact has been shown bySeelig and Joseph,27 who cut the vasomotor nerve proceeding to thevessels of one ear of a white rabbit and thus caused a local paralyticdilatation of the vessels. Intense shock was then produced in the animalin the usual way, after which the blood pressure in the anterior part ofthe animal was suddenly raised by applying a clamp to the abdominalaorta just below the This increased blood pressure causedthe vessels of the denervated ear to become engorged with blood, butnot those of the opposite normal ear, which retained their tone (). (4) The volume of blood expelled by the ventricles has beenshown by Henderson28 to be distinctly diminished in the early stages ofshock, the lack of pronounced fall in blood pressure indicating that theremust be a compensatory constriction of the arterioles. Lastly (5), ithas been found by Morrison and Hooker29 that the outflow of bloodfrom the perfused organs of a shocked animal is less from the \. Fig. 106.—Illustration showing the appearance of the blood vessels in the , ears of a rabbitin a state of deep shock. The marked vasoconstriction is very plain in the left ear. the ves-sels of the right ear being dilated because the cervical sympathetic, which carries the constrictorlibers, has been cut. (From Seelig and Joseph.) shock 291 same organs under normal conditions. Furthermore, severing of thenerve of such an organ causes an increased out How. To these various pieces of evidence of a constricted condition of atleast certain of the vessels in shock, may be added the less direct evi-dence furnished by the pallor of the shocked patient and the indicationsthat the sympathetic nervous system, instead of being paralyzed, isin an excited state, as shown by the sweating and the dilated , we know from the experiments of Pike, Guthrie andStewart on the resuscitation of the nerve centers after interferencewith the ci
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