File:Chordate anatomy (1939) (19990287053).jpg

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Title: Chordate anatomy
Identifier: chordateanatomy00neal (find matches)
Year: 1939 (1930s)
Authors: Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960
Subjects: Chordata; Anatomy, Comparative
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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THE UROGENITAL SYSTEM 303 seminal groove of the reptile has become a tubular canal surrounded by erectile tissue, the corpus cavemosum urethrae. This canal is used in monotremes for the passage of sperm only, while urine passes from the bladder to the cloaca by way of a urinary canal. In addition to the erectile tissue of the corpus cavemosum urethrae, paired masses of erectile tissue, the corpora cavernosa penis, make their appearance in the phallus of monotremes. The posterior free portion of the phallus
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Fig. 270.—Diagrams of male urogenitalia in I, monotreme; II, marsupials; and III. monodelphs. a, anus; h, bladder; c, cloaca; cu, corpus cavemosum urethrae; cp, corp. cav. penis; cd, Cowper's gland; p, perineum; pg, prostate gland; r, rectum; s, symphysis pubis; t, testis; u, ureter; v, vas deferens; vg, vesicular gland; i/w, ventral muscles. (From Kingsley's "Comparative Anatomy of Vertebrates," after Weber.) of monotremes becomes more elongated than in reptiles, by an integumentary fold, the preputial sac, which erection. (Fig. 270) In marsupials and placental mammals, with the the cloaca, the phallus becomes more independent as The urinary canal of monotremes disappears, and the to the outside through the urogenital canal or urethra, with an enlarged corpus cavemosum urethrae persists. and is surrounded disappears during disappearance of an external penis. urine is conveyed The glans penis In the female, it

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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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