394 DK. C. F. SOXXTAG OX THE AXATOMV, 



accompanied by numerous s^-mpathetic nerves and lymphatics. 

 The arrangement of the system facilitates a slow and even flow 

 of blood from the digestive organs. 



Tribtdaries : — 



1. Splenic rein (S.T) formed by several veins from the hilus 

 of the spleen. It passes through the lieiio-renal ligament and 

 unites behind the pancreas with the inferior mesenteric vein. 

 It receives (a) rasa hrevia i^V.B) from the body of the stomach ; 

 (b) left gastro-epiploic vein (L.G.E.T) which runs along the 

 greater curvature of the stomach, receiving veins from it, and 

 connects the .splenic and duodenal veins; (c) pancreatic veins. 



2. Inferior mesenteric vein (l.^.V). which communicates with 

 the superior mesenteric vein by a vessel which runs through 

 the ti"ansverse meso-colon and supplies the transverse colon 

 (T.M.C.T). It drains the large bowel from the splenic liexui-e 

 to the beginning of the rectum, and it unites with the splenic 

 vein. 



3. Superior mesenteric rein (S.M.V), which drains the ileum 

 and jejunum, and the large intestine from the appendix to the 

 hepatic flexure, communicates with the venous arch in the trans- 

 verse colon. At the point where it participates in the fonnation 

 of the portal vein it receives the venous arch of the ti-ansveree 

 colon, duodenal veins {d.v) and gastric veins (g.v). 



4. The cystic vein (c.v) enters the portal trunk itself. 



The Inferior Caved Si/steni. 



The vena cava inferior is formed by the union of the two 

 common iliac veins deep to the right common iliac ai-tery. It 

 ascends on the right side of the abdominal aorta. In the upper 

 part of the abdomen it bends to the right and passes through 

 a tunnel in the liver. Its relations are much as in the human 

 body, but the right ovarian artery passes behind it. It 

 receives : — 



1. Four single lumbar veins, the first or lowest entering the 

 left side of the vein, and the others pass into its dorsal surface. 



2. Sight ovaHan rein. 



3. Two renal veins. 



4. Bight suprarenal vein. 



5. Gnstric rein which serves as a link between the systemic 

 and. portal circulations. 



6. Hepatic veins. 



Veins of the Pelvic Extremity. 



Superficial Veins : — The venous arch on the dorsum of the foot 



i*eceives veins from both sides of the digits. The inner extremity 

 is continued upwai-ds by two internal saphena veins, which are 

 united by cross branches. They pass upwards, dip under the 

 sartorius and end in the femoral vein. The large external 

 saphena vein runs up the back of the leg, dips through the fat 



