Volume 1

A textbook of human physiology / / translated from [the] 7th German edition by William Stirling.

  • Landois, Leonard
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A textbook of human physiology / / translated from [the] 7th German edition by William Stirling. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    section of the medulla oblongata], then, owing to the great dilatation of all these vessels, the blood-pressure falls at once throughout the arterial system. The result of this may be, provided the pressure is sufficiently low, that there is a great decrease or, it may be, entire cessation of the secretion of urine. The secretion is arrested when the cervical cord is completely divided, down even as far as the seventh cervical vertebra (Eckhanl). The polyuria caused by injury to the floor of the fourth ventricle at once disappears when the spinal cord (even down to the twelfth dorsal nerve) is divided. [4. Other Conditions. — As already stated, section of the renal nerves is followed by polyuria, owing to the i ncreased pressure in the glomeruli, but this polyuria may be in- creased by stimulating the spinal cord below the medulla oblongata, because the contraction of the blood - vessels Fig. 347. View of renal oncometer ; the small one is shown open. throughout the body still further raises the blood-pressure within the glomeruli. If, however, the spinal cord be divided below the medulla oblongata—the renal nerve being also divided—the polyuria ceases, because of the fall of the general blood-pressure thereby produced. Division of the spinal cord in the dorsal region Fig. 348. Fig. 349. Fi* 348.—Oncometer. K, kidney ; the thick line is the metallic capsule ; h, hinge ; I, tube ° for filling apparatus ; T, tube to connect with Tj ; a, v, to, artery, vein, ureter (Stirling, after Hoy). Fig. 349.—Oncograph. C, chamber filled with oil, communicating by Ij with T ; p, piston ; I, writing-lever (Stirling, after Roy). also diminishes or arrests the secretion of urine, owing to the fall of the blood- pressure j but animals recover from this operation, the general blood-pressure rises, and with it the secretion of urine. Stimulation of the cord below the medulla arrests the secretion, as it causes contraction of the renal arteries along with the other arteries of the body.] . /nm, [Volume of the Kidney—Oncometer.—By means of the plethysmograph Q lui;