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Encyclopedia Britannica



COELOM AND SEROUS

This article appears in Volume V27, Page 972 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: CLI-COM
COELOM AND SEROUS MEMBRANES) and the oblique vein of Marshall.
It can be readily reconstructed from
figs
 . 4 and 5 if the transverse communication (L.I.) is obliterated. In some mammals the postcaval vein is
double
 , especially, in its hinder (caudal)
part
 , and this sometimes occurs as a human abnormality (see F. W. McClure, Am. Journ. of Anat. vol. 2, 1903, and vol. 5, 1906, also Anat. Anzeiger, Bd. 29, 1906).
Except in Cetacea, one or both azygos veins are always present in mammals. When there is only one it is usually the right, though a few forms among the marsupials, rodents and ungulates have only the left (F. E. Beddard, P.Z.S., 1907, p. 181). In many of the
lower
  mammals the external jugular vein is much larger than the
internal
  and returns most of the blood from the brain through an opening called the postglenoid foramen. For this reason it was formerly regarded as the representative of the primitive jugular. It. is now, however, thought that the
internal
  jugular is that representative, and that the arrangement of man,. in which the internal jugular drains the interior of the cranium, is the more generalized and primitive.
For further details and literature see R. Wiedersheim's
Comparative
  Anatomy of Vertebrates, translated by W. N.
Parker
  (London, 1907). (F. G. P.)


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