Jones Quain
Published: 2018-10-12
Total Pages: 168
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Excerpt from Quain's Elements of Anatomy, Vol. 4 of 4: Part III, the Heart One part of the systemic circulation, that of the abdominal alimentary viscera, requires to be specially mentioned. It will be noted (fig. 1) that the arteries distributed to these viscera (m, M, M) terminate in capillary systems in the usual manner, but the veins which arise from these systems (p) do not directly join the inferior vena cava but end in a common trunk, the portal vein, which passes to a further capillary system in the liver (h); and from this system veins pass to the inferior vena cava. This part Of the systemic circulation, which begins and ends in capillary systems, is known as the entero-hepatic or portal circulation. A portal system is said to be formed when a vein arising from the capillaries of a part instead of uniting with other veins and proceeding towards the heart breaks up into a second set of capillaries in another organ. The particular example described above is therefore the hepatic portal system, but other portal systems may exist, for example, the renal portal system in the majority of fishes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.