File:A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine (1890) (14763188302).jpg

Identifier: textbookofcompar00mill (find matches)
Title: A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine
Year: 1890 (1890s)
Authors: Mills, Wesley, 1847-1915
Subjects: Physiology, Comparative
Publisher: New York, London, D. Appleton and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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etc., there may be excess-ive activity of the muscular tissue of the bladder walls. 8.Evacuation of the bladder may occur in the absence of con-sciousness (sleep). The most obvious conclusions from these facts are that—1.The urine finds its way to the bladder partly through muscular(peristaltic) contractions of the ureters, partly through gravity,in man at all events, and partly from the pressure within thetubules of the kidneys themselves. 2. The evacuation of urinemay take place independently of the will (see 8), and is a reflex(5) act. 3. Micturition may be initiated by the will, which isusually the case, when by the action of the abdominal musclesa little urine is squeezed into the urethra, upon which afferentimpulses set up contractions of the bladder by acting on thedetrusor center of the cord and at the same time inhibit thecenter presiding over the sphincter (if such there be), permit-ting of its relaxation. 4. Emotions seem to interfere with the EXCRETION BY THE KIDNEY. 425
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Fig. &0.—Superior and general view of the genito-urinary apparatus in the stallionwith the axtenesr,(Chauveau). A, left kidney; B, right kiduev a b ureters- C Csuprarenal capsules; D, bladder; E. E. testicles; e, head of epididimis; , tailof epididimis; *, deferent canal; G, pelvic dilatation of deferent canal- H leftseminal vesicle; the right has been removed, along with the deferent canal of 426 COMPARATIVE PHYSIOLOGY. same side, to show insertion of ureters into bladder; I, prostate; J, Cowpersglands; K, membranous or intra-pelvic portion of urethral canal; L, its bulbousportion; M, cavernous body of penis; in, m, its roots; N, head of penis; 1, ab-dominal aorta; 2,2, arteries (renal) giving off principal capsular artery; 3, sper-matic artery; 4, common origin of umbilical and arteries of bulb; 5, umbilicalartery; 6, its vesical branch; 7, internal artery of bulb; 8, its vesico-prostaticbranch. ordinary control of the brain-centers over those in the spinalcord. 5. It may be a

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