File:A text-book of human physiology (1906) (14770092742).jpg

Identifier: textbookofhumanp00tige (find matches)
Title: A text-book of human physiology
Year: 1906 (1900s)
Authors: Tigerstedt, Robert, 1853-1923 Murlin, John R. (John Raymond), b. 1874, tr
Subjects: Physiology
Publisher: New York and London, D. Appleton and Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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he senseof fullness of the bladder. This is preceded by a greater degree of ten-sion of the bladder wall. Cold and warm fluids in the bladder also causethe sensation named and the consequent desire to urinate, but indifferentfluids at the temperature of the body, especially urine, are not felt at all.Stimulation of the prostatic part of the urethra is felt, but does not pro- 392 THE EXCRETIONS OF THE BODY duce the desire to empty the bladder; hence the doctrine that this desireis due to the escape of the urine into the urethra is not correct (Guyon).The flow of urine can be suppressed by voluntary contraction of the outersphincter (probably also of the inner). Micturition results from a voluntary relaxation of the external sphincter,whereupon the reflex contraction of the whole musculature of the bladder, Nerves tocceliac Sympathetic axis nerves Superior mesenteric ganglion Connectingstrands Superiormesenteric nerve 5Ied. mes. nerve Inf. mes. nerve Nerve to mes. artery Inf. mes. gang.
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in. Lumbarvertebra Ramuscommunicans IV. Lumb. vert. V. Lumb. vert. ., Rami communicantes VI. Lumb. vert. Hypogastricnerves VII. Lumb. vert. _ Vesical plexus Hypogastric plexus Sciatic nerve-■^-\-— Sacral nerves —\\—1-^ Coccyx Fig. 145.—The nerves of the bladder, after NawTocki and Skabitschewsky. including that of the internal sphincter, follows. A large part of the longi-tudinal fibers pass over without interruption into the fibers of the sphincter—an arrangement which insures the dilatation of the opening. (Rehfisch advo-cates the view that the internal sphincter also relaxes when the passage isopened.) Micturition is aided by the bulbo-cavernosus muscle, in that itcompresses the bulbous urethrae, thus expelling the contents of the latter. Ab- MICTURITION 393 dominal pressure plays no essential part in micturition, and unaided is notsuiiicient to empty the bladder. The bladder receives its motor nerves in part from the lumbar, in partfrom the sacral nerves (Fig. 145). Th

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