752 



THE VASCULAR SYSTEMS 



long thoracic, the internal mammary, the intercostals, the external pudic, and the lumbcvertebral 

 anastomotic veins of Braune effect the communication with the superior cava; in the second, 

 the deep anastomosis is made by the azygos major and minor and the lumbar veins. 



Tributaries. It receives in its course the following veins: 



Lumbar. 



Right spermatic, or ovarian. 



Renal. 



Suprarenal. 

 Inferior phrenic. 

 Hepatic. 



The lumbar veins (vv. lumbales), four in number on each side, collect the 

 blood by dorsal tributaries from the muscles and integument of the loins and by 

 abdominal tributaries from the walls of the abdomen, where they communicate 

 with the epigastric veins. At the vertebral column they receive veins from the 

 spinal plexuses, and then pass forward, around the sides of the bodies of the 



FIG. 527. Spermatic veins. (Testut.) 



vertebra? beneath the Psoas magnus muscle, and terminate at the back part of 

 the inferior vena cava. The left lumbar veins are longer than the right, and 

 pass behind the aorta. The lumbar veins of either side are connected by a 

 longitudinal vein which passes in front of the transverse processes of the lumbar 

 vertebrae, and is called the ascending lumbar vein (v. lumbalis ascendens] (Fig. 

 515). It forms the most frequent origin of the corresponding azygos vein, and 



