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COELOM AND SEROUS

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Originally appearing in Volume V27, Page 972 of the 1911 Encyclopedia Britannica.
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COELOM AND SEROUS MEMBRANES) and the oblique vein of See also:

Marshall. It can be readily reconstructed from See also:figs. 4 and 5 if the transverse communication (L.I.) is obliterated. In some mammals the postcaval vein is See also:double, especially, in its hinder (caudal) See also: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 See also:Cetacea, one or both azygos See also:veins are always See also: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 See also:

left (F. E. Beddard, P.Z.S., 1907, p. 181). In many of the See also:lower mammals the See also:external jugular vein is much larger than the See also:internal and returns most of the See also:blood from the See also:brain through an opening called the postglenoid foramen. For• this See also:reason it was formerly regarded as the representative of the See also:primitive jugular. It. is now, however, thought that the internal jugular is that representative, and that the arrangement of See also: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 See also:Comparative See also:Anatomy of Vertebrates, translated by W. N. See also:Parker (See also:London, 1907). (F.

G.

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