Portal circulations and their relation to counter-current systems.

J R Henderson, P M Daniel
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引用次数: 46

Abstract

We have reviewed the distribution of portal circulations throughout the animal body; they are commoner than is generally supposed. Most portal circulations consist of two serial capillary beds connected by one or more larger vessels. We have called these 'convergent' portal circulations: examples are hepatic portal, placental, hypophysial, renal, ovarian and testicular circulations, as are parts of the lymphatic circulation. A second type of portal circulation, which is less common, consists of two serial capillary beds that are not connected by larger vessels. These we have called 'continuous' portal circulations: adrenal and pancreatic circulations are examples of this type. When a countercurrent concentrating mechanism exists in the body it is always part of the primary or secondary bed of a convergent portal circulation, though some convergent portal circulations are not associated with countercurrent mechanisms.

传送门循环及其与逆流系统的关系。
我们已经回顾了整个动物体内门静脉循环的分布;它们比一般认为的要普遍。大多数门静脉循环由两个连续的毛细血管床组成,由一个或多个较大的血管连接。我们称这些为“收敛性”门静脉循环:例如肝门静脉、胎盘、垂体、肾脏、卵巢和睾丸循环,以及淋巴循环的一部分。第二种不太常见的门静脉循环由两个连续的毛细血管床组成,它们没有被更大的血管连接。我们称之为“连续”门静脉循环:肾上腺和胰腺循环就是这种类型的例子。当体内存在逆流浓缩机制时,它总是会聚门静脉循环的初级或次级床的一部分,尽管有些会聚门静脉循环与逆流机制无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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