. Elements of human physiology. Physiology. FUNCTIONS OF THE KIDNEYS AND SKIN 471 The sensory nerves of the bladder probably run in the upper (sympathetic) supply. According to some authors these two sets of fibres are antagonistic in function. Stimulation of tlie liypogastric nerves is said to cause contraction of the circular fibres of the bladder-wall, and therefore increased contraction of the sphincter vesicJB, whereas stimulation of the nervi erigentes causes relaxation of Fig. 222. Sujf mes. ganglion. —• Jnf: mesenteric ganglion, Jfypogdjtric Hemes. Hecftfm. — ''.LumhaT jverfe^
. Elements of human physiology. Physiology. FUNCTIONS OF THE KIDNEYS AND SKIN 471 The sensory nerves of the bladder probably run in the upper (sympathetic) supply. According to some authors these two sets of fibres are antagonistic in function. Stimulation of tlie liypogastric nerves is said to cause contraction of the circular fibres of the bladder-wall, and therefore increased contraction of the sphincter vesicJB, whereas stimulation of the nervi erigentes causes relaxation of Fig. 222. Sujf mes. ganglion. —• Jnf: mesenteric ganglion, Jfypogdjtric Hemes. Hecftfm. — ''.LumhaT jverfe^ ':-/>ympal}idio chain. •Lumhar mrve3. " _; A'eri'i eriffenies. tectum. Diagram of nerve-supply to bladder. (Nawrocki and Skabitchewsky.) the sphincter and a strong contraction of the detrusor urin®. The sacral fibres are therefore those which are most important for the act of micturition. The whole question of the behaviour of the sphincter however is in need of renewed investigation, in view of the anatomical results mentioned above. In the adult the processes of retention and evacuation of urine are modified and controlled by voluntary effort. The normal action of the sphincter mechanism may be aided by the contraction of the perineal muscles which keep the urethra closed. The reflex process of evacuation may be. 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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