1104 



SURGICAL AXD TOPOGRAPHICAL ANATOMY 



mastoid, and passing obliquely inwards across the scalenus anticus (the posterior 

 borders of the above two muscles roughly correspond to each other in the lower 



Fig. 677.— The Collaterai, Circllatiox after Ligature of the Commox Carotid and 



SuBCLAYiAX Arteries. 



(A ligature is placed on the commou carotid aud on the third portion of the 

 subclavian artery.' 



Biffht 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 



Supraspinous 



branch 



Anterior circumflex 



Infraspinous 



branch 



Posterior cirtumfler 



Long thoracic 



Subscapular 



Dorsal scapulai 



Infrascapular 



Subscapului 



Superior thyroid 



Left anterior cerebral 

 Anterior communicating 



Posterior conununicaling 

 Left posterior cerebral 



Basilar 



Anterior spinal 



Inferior thyroid 

 Common carotid 



Thyroid axis 

 Superior intercostal 



Innominate 

 Superior intercostal 

 Left common carotid 

 Left subclavian 

 Short thoracic 

 Internal mammary 



Anterior intercostal 



First aortic inter- 

 costal 



Second aortic inter- 

 costal 



Anterior intercostal 



Third aortic inter- 

 costal 



part of the neck), it descends under the subclavian vein and clavicle to enter the 

 thorax. 



The level of the brachial plexus (upper border) would be given l)y a Jine 



