The internal secretions and the principles of medicine . abit-ually obvious, like the ear, dilatation of those of neighhorimjregions, the u])per and lower lij), the palatine arch, and thisvery clearly in the dog. Hence the sympathetic contains inhi-bitory vascular nerves. Interpreted from my standpoint,however, this does not indicate the presence of such , ^loiat ])iiblishes the colored engraving reproduced below. Morat: Physiol, of the Nerv. Sys., transl. by Syers, p. 317, 1906. Morat: Lor. vit., p. 318. SYMPATHETIC AND STRICTO-DILATORS. 1189 in which the elfects of stimulation of
The internal secretions and the principles of medicine . abit-ually obvious, like the ear, dilatation of those of neighhorimjregions, the u])per and lower lij), the palatine arch, and thisvery clearly in the dog. Hence the sympathetic contains inhi-bitory vascular nerves. Interpreted from my standpoint,however, this does not indicate the presence of such , ^loiat ])iiblishes the colored engraving reproduced below. Morat: Physiol, of the Nerv. Sys., transl. by Syers, p. 317, 1906. Morat: Lor. vit., p. 318. SYMPATHETIC AND STRICTO-DILATORS. 1189 in which the elfects of stimulation of the sympathetic areclearly illustrated. Dilation of the pupil and exophthalmosare plainly shown, but the salient features are the pallor of oneside of the tongue and ear, as contrasted with the congestion ofthe lips, gums and palatine arch of the corresponding , Morat ascribes the localized pallor to vasoconstriction—which is undoubtedly true; the congestion, however, he attrib-utes to inhibition of this vascular constriction, the sympathetic. Effects of Stimulation of the Cervical Sympathetic. (Morat). being supposed to send vasodilator fibers to the vessels of thecorresponding area. The nerve is thus regarded as actingsimultaneously as constrictor and dihitor. though in differentareas. From my standpoint, a simpler and more logicalexplanation asserts itself, viz., the arterioles of the pale areabeing alone supplied by the cervical sympathetic, they contractwhen the latter is stimulated; these small vessels being mark-edly constricted as shown liy tlie pallor, the circulation throughthem is blocked and the blood accumulates in the other ves-sels—those of the congested area. That the vessels of one side 1190 INTERNAL SECRETIONS IN PHARMACODYNAMICS. only should be alfected is obviously due to the fact that eachside has its own arterial supply derived from the correspondingcarotid. As to the supposed vasodilator properties of sympatheticnerves, Langley/- who, by the w
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