Title: Elements of the comparative anatomy of vertebrates
Identifier: elementsofcompar00wied (find matches)
Year: 1886 (1880s)
Authors: Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923
Subjects: Anatomy, Comparative; Vertebrates -- Anatomy
Publisher: London, New York, Macmillan
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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276 COMPARATIVE ANATOMY. definitive urinary bladder and urethra. Indications of the point of exit of the allantois and vitcllo-intestinal duct (umbilical cord) from the body-cavity can be seen in the adult at the navel, or umbilicus, Avhich represents the last point at which the body-walls become united. PC(CLf)
Text Appearing After Image:
FIG. 220.—DIAGRAMMATIC SECTION THROUGH THE HUMAN GUAVID UTERUS. U, uterus ; T/>, Tb, Fallopian tubes ; UIT, uterine cavity ; Dv, cleeidua vera, which at Pu passes into the uterine portion of the placenta ; 7V, decidna rellcxa ; Pf, f<etal portion of the placenta (chorion frondosuni, Clif); Chi, chorion Iteve ; A, .1, the cavity of the anniion filled with lluid : in the interior of the amnion is seen the embryo suspended by the twisted umbilical cord ; //, heart ; A, ami a ; cs, precaval ; <•!, postcaval; p, portal vein ; At, allantoic (umbilical) artcrio : f, the liver, perforated by the umbilical vein ; D, the remains of the yolk-sac (umbilical vesicle). The branchial vessels never become functional as such, in any period of development either in Mammalia or Suuropsida, but those which persist give rise to important vascular trunks of the neck, head (carotids), upper extremity (subclavian), and lungs (pulmonary artery), and also to the roots of the aorta, one or both of which m;iy remain (comp. Fig. 221, A to D).

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