. Elements of human physiology. Physiology. 272 PHYSIOLOGY any organ of the abdomen in a plethysmograph. Fig. 152 represents a curve of the splenic volume, and shows the marked expansion, together with fall of general blood-pressure resulting from stimulation of the depressor nerve. All sensory nerves are pressoj- nerves, stimulation of their central end causes a marked rise of blood-pressure in animals under curare and morphia. Thus a rise of the general blood-pressure follows stimulation of the central end Fig. Blood-pressure curve from rabbit showing effect of excitation of centr
. Elements of human physiology. Physiology. 272 PHYSIOLOGY any organ of the abdomen in a plethysmograph. Fig. 152 represents a curve of the splenic volume, and shows the marked expansion, together with fall of general blood-pressure resulting from stimulation of the depressor nerve. All sensory nerves are pressoj- nerves, stimulation of their central end causes a marked rise of blood-pressure in animals under curare and morphia. Thus a rise of the general blood-pressure follows stimulation of the central end Fig. Blood-pressure curve from rabbit showing effect of excitation of central end of depressor nerve (mercurial manometer). (Bayliss.) of the cut sciatic or superior laryngeal nerves (Fig. 153). This rise of pressure is due to constriction of the arterioles, especially in the splanchnic area. The effect however of excitation of a purely sensory nerve is not quite so simple as at first appears. In many cases stimulation of the central end of a sensory nerve causes general arterial constriction with a rise of blood-pressure, and at the same time a vaso-dilatation in the area of distribution of the nerve. This can be demon- strated by exciting the central ends of the posterior roots of the nerves to a limb, which causes a swelling of the limb due. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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