478 



THE ARTERIES 



sterno-thyroid muscles, and is crossed by the anterior jugular vein, and is often 

 overlapi)ed l)y the thyroid body. Opposite the cricoid cartilage it is crossed obliquely 

 l)y the onio-hyoid muscle; and ai)0ve this spot by the middle and superior thyroid, 



Fig. 3:50.— The Collateral CiEcrLAXiox after Ligature of the Common Carotid and 



Subclavian Arteries. 



(A ligature is placed on the common carotid and on the third portion of the subclavian arter}'.) 



Right anterior cerebral 



Internal carotid 

 Right posterior cerebral 



Occipital 

 Princeps cervicis 



External carotid 



Superficial branch of princeps cervicis 



Deep branch 



Ascending cervical 



Transverse cervical 



Posterior scapular 



Acromial branch 



Subscapular branch 



Sujirasjiinoiis branch 



Anterior circumflex ■ \ i 

 Infraspinous branch — * 

 Posterior circumflex 

 Long thoracic 

 Subscapular 



Dorsal scapular 

 Jn/rascnpular 



Subscapular 



Superior thijroiii 



Left anterior cerebral 

 Anterior communicating 



Posterior communicating 

 Left posterior cerebral 



Anterior spinal 



Inferior thyroid 

 Cfinimon carotid 



Thyroid axis 

 Superior intercostal 



Innominate 

 Sujierior inter costal 

 Left common carotid 

 Left sub cl avian 

 Short thoracic 

 Internal mammary 



Anterior intercostal 



First aortic inter- 

 costal 



Second aortic inter- 

 costal 



Anterior intercostal 



Third aortic inter- 

 costal 



the lingual, and generally the facial veins in their course to the internal jugular, 

 and by the middle sterno-mastoid artery as it passes from the superior thyroid artery, 

 its usual source, on its way down to the sterno-mastoid muscle. Along the anterior 



