736 



THE VASCULAR SYSTEMS 



An expansion of the aponeurosis of the Subclavius muscle lies upon the vein 

 (Fig. 513). 



The subclavian vein occasionally rises in the neck to a level with the third part 

 of the subclavian artery, and in two instances has been seen passing with this 

 vessel behind the Scalenus anticus. It is usually provided with a pair of valves 

 about an inch from its termination. 



AXILLARY 

 ARTERY 



MUSCULO- 

 CUTANEUS NERVE 



MEDIAN NERVE 



ANTERIOR 

 CIRCUMFLEX 



CCSTOAXILLARY 



LONG THORACIC 



FIG. 512. The veins of the right axilla, viewed from in front. 



COSTOAXILLARY 



(Spalteholz.) 



PECTORALIS 



MAJOR- 

 MUSCLE 



SUBCLAVIUS 

 MUSCLE 



Tributaries. It receives the ex- 

 ternal jugular vein, sometimes the 

 anterior jugular vein, and occasion- 

 ally a small branch from the ceph- 

 alic. At the angle of junction with 

 the internal jugular the left sub- 

 clavian vein receives the thoracic 

 _duct (F'ig. 514), while the rid it 

 subclavian vein receives the rip-hf: 

 lymphatic duct. 



The innominate or brachio- 

 cephalic veins (vv. anonymae) (Fig. 515) are two large trunks, placed one on 

 either side of the root of the neck, and formed by the union of the internal 

 jugular and subclavian veins of the corresponding side. 



The right innominate vein (v. anonyma dextra) is a short vessel, an inch in 

 length, which commences at the inner end of the clavicle, and, passing almost 

 vertically downward, joins with the left innominate vein just below the cartilage 

 of the first rib, close to the right border of the sternum, to form the superior vena 



FIG. 513. The aponeurptic expansion of the Subclavius 

 muscle over the subclavian vein. (Poirier and Charpy.) 



superior 



cava. 



It lies superficial and external to the innominate artery; on its right side 

 is the phrenic nerve, and the pleura is here interposed between it and the apex 

 of the lung. This vein, at the angle of junction of the internal jugular with the 



