The Gastric Venous System of the Domestic Goose

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  • ガチョウの胃の静脈系
  • ガチョウ ノ イ ノ ジョウミャクケイ エイブン

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In the preventriculus of the domestic goose, there are the V. proventricularis dextra and V. proventriculolienalis, both of which are absent in the duck. The former is not so developed that the venous blood from the right dorsal part of the proventriculus is drained caudally by the well-developed Anastomosis cum v. proventriculari sinistra and empties into the Pars transversa of the R. sinister v. portae via the V. proventricularis sinistra. Although it is difficult to estimate the accurate distribution of venous blood of the avian proventriculus, more than half of the blood from the proventriculus of the goose is collected into the precava after passing through the V. proventricularis cranialis due to the prescnce of the poorly formed V. proventricularis dextra. In the wall of the proventriculus of the goose there is a rather dense venous network formed by anastomoses of V. proventricularis cranialis, V. proventricularis dextra, V. proventricularis sinistra and V. gastroproventricularis which empties into the V. gastrica sinistra. The systemic circulation is connected more closely with the portal circulation by this network in the goose than in duck and chicken. There are no differences between the arterial and venous supplies in the ventriculus (muscular stomach) of the goose. Arterial branches perforate the tissues of this organ in the marginal area and the intermuscular groove like venous tributaries. The proventricularis sinistra, V. gastrica intermuscularis, V. gastrica ventralis and V. gastrica sinistra empty independently into the left hepatic lobe in the goose. Since all of them have the same function in the hepatic portal system, it is proposed to use the V. portae hepatis sinistra as the general term for the four veins.

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