. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 361 The veins of the intestines commence by a dense network, that receives the minute venous radicles into which the capillaries of the mucous and muscular coats return their blood. This plexus has the same submucous situation, and flattened shape, as the cor- responding arterial network already men- tioned; but, like the venous system in general, is composed of more numerous and larger branches. It gives off a number of veins ; which leave the intestine, and gradually unite into the vessels that c
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. STOMACH AND INTESTINE. 361 The veins of the intestines commence by a dense network, that receives the minute venous radicles into which the capillaries of the mucous and muscular coats return their blood. This plexus has the same submucous situation, and flattened shape, as the cor- responding arterial network already men- tioned; but, like the venous system in general, is composed of more numerous and larger branches. It gives off a number of veins ; which leave the intestine, and gradually unite into the vessels that converge to form the various trunks. These branches have a tole- rable correspondence with the primary rami- fications of the arteries from the coeliac axis and the two mesenteric vessels. Many of Fig. Branches of the portal vein. a, trunk of the portal vein; b, superior mesenteric vein; c, inferior mesenteric vein; d, splenic vein, joined by the, e, gastro-epiploic and pyloric veins ; f, pancreatico-duodenal veins; </, branch of the portal trunk to the left lobe of the liver; //, similar branch to the right lobe. (The remaining letters indicate as in the pre- ceding figures.) them unite to form two chief trunks, the superior and the inferior mesenteric veins. While others open directly into the splenic vein ; or into the vena porfee, which is formed by the junction of it and these mesenteric veins. The superior mesenteric vein (b, Jig. 279.), which receives the venous blood from that portion of intestine supplied by the artery of the same name, travels for some distance in company with the latter vessel ; lying on its right side, and somewhat superficially to it, and surrounded by very numerous lacteals and nerves. But near the lower bordtr of the third portion of the duodenum, it swerves towards the right side, from what was hitherto an almost vertical course upwards ; and after crossing in front of the duodenum at nearly a right angle, ends by joining the splenic v
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