. Chordate anatomy. Chordata; Anatomy, Comparative. 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. Fig. 270.—Diagrams of male urogenit
. Chordate anatomy. Chordata; Anatomy, Comparative. 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. 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. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
