A text-book of physiology for medical students and physicians . 6S0 PHYSIOLOGY OF RESPIRATION. movements. This experimental result is confirmed by our ownexperience, since every one must have noticed that the respiratorymovements are readily affected by strong stimulation of the cutane-ous nerves—a dash of cold water,for example—as well as throughthe nerves of sight and addition, emotional states areapt to be accompanied by notice-able changes in the respirations,and corresponding to this factexperiment shows that stimula-tion of certain portions of the cor-tex and midbrain gives di
A text-book of physiology for medical students and physicians . 6S0 PHYSIOLOGY OF RESPIRATION. movements. This experimental result is confirmed by our ownexperience, since every one must have noticed that the respiratorymovements are readily affected by strong stimulation of the cutane-ous nerves—a dash of cold water,for example—as well as throughthe nerves of sight and addition, emotional states areapt to be accompanied by notice-able changes in the respirations,and corresponding to this factexperiment shows that stimula-tion of certain portions of the cor-tex and midbrain gives distincteffects upon the respiratory cen-ter. We must assume, therefore,that this center is in connectionwith the sensory fibers of per-haps all of the cranial and spinalnerves, and is influenced also byintracentral paths passing fromcerebrum to medulla, paths whichare efferent as regards the cere-brum, but afferent as regards themedulla. As stated above, theeffect of these sensory nervesupon the activity of the respiratory center is varied; the rate ma>. Fig. 276.—To show the augmenta-tion of the respiratory movements causedby stimulation of the sciatic nerve. Ex«periment upon a rabbit.
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