664 A MANUAL OF ANATOMY 



As it courses along the iliac crest it furnishes branches to 

 the muscles of the abdominal wall, some of which reach the 

 gluteal region, where they anastomose with the gluteal of the 

 internal iliac and the superficial circumflex iliac ot the common 

 femoral. It also gives branches to the iliacus muscle, which 

 anastomose with the iliac branch of the ilio-lumbar from the 

 internal iliac. One of the muscular branches of the artery is 

 very constant and of large size. It springs from the vessel near 

 the anterior superior iliac spine, and, having pierced the fascia 

 transversalis and transversalis muscle, it ascends vertically between 

 that muscle and the internal oblique, where it anastomoses with 

 the abdominal branches of the lumbar arteries. This branch is 

 usually spoken of as the ascending branch, but it may be called the 

 lateral or intermuscular epigastric. 



The deep circumflex iliac artery is accompanied by two venae 

 comites. These ultimately join to form one vessel, which crosses 

 the external iliac artery from without inwards about | inch above 

 Poupart's ligament, and terminates in the external iliac vein. 



The lower two intercostal arteries ultimately leave the tenth and 

 eleventh intercostal spaces and pass towards the rectus muscle, 

 lying in their course between the internal oblique and transversalis. 

 They anastomose with the superior epigastric, deep epigastric, and 

 subcostal arteries. 



The subcostal artery lies below the last rib, and is in series with 

 the aortic intercostal arteries above and the lumbar arteries below. 

 On the abdominal wall it anastomoses with the last intercostal, the 

 abdominal branch of the first lumbar, and the superior epigastric, 

 arteries. 



The abdominal branches of the lumbar arteries pass forwards 

 towaids the rectus abdominis. They anastomose with the deep 

 epigastric, subcostal, and lateral or intermuscular epigastric of the 

 deep circiimflex iliac. 



The veins corresponding to the lower two intercostal arteries 

 terminate in the corresponding intercostal veins. The subcostal 

 vein of the right side terminates in the right azygos vein, and that 

 of the left side in the lower left azygos vein. The veins accom- 

 panying the abdominal branches of the lumbar arteries terminate 

 in the lumbar veins, which are tributaries of the inferior vena cava. 



Deep Lymphatics. — The deep lymphatics of the lower part of the 

 anterior abdominal wall accompany the deep epigastric and deep 

 circumflex iliac vessels, and terminate in the external iliac glands ; 

 those of the upper part accompany the superior epigastric artery, 

 and terminate in the sternal glands. 



The deep lymphatics of the lower part of the lateral abdominal 

 wall accompany the abdominal branches of the lumbar arteries 

 and the ilio-lumbar artery, and terminate in the lateral group of 

 lumbar glands ; those of the upper part accompany the adjacent 

 anterior intercostal and musculo-phrcnic arteries, and terminate 

 in the sternal glands. 



