418 



A. intercostalis suprema 

 Truncus costocervicalis 



A. bronchlalis \ 



A. intercostalis VII 



Arteries of the Trunk. 



A. carotis communis dextra 



A. subclavia dextra 



A. bronchialis 



Aorta thoracalis 



Ramus posterior 

 Eamus anterior 



461. Aorta thoracalis, viewed from in front. 



(On the left side the nun. iut(>reustales interui and subcostales have been removed ; the dia- 



])hra^'m has been cut away at its origins.) 



The aorta tllOracalis (thoracic aorta) (see also Figs. 556, 629631) runs, from 

 the left side of the body of the 4^h thoracic vertebra on, downward and somewhat to the right 

 and passes in front of tlie lower margin of the 12"i thoracic vertebra, a little to the left of 

 the median plane, through the hiatus aorticus of the diaphragm and there goes over into the 

 aorta abdominalis. On the left side it is directly adjacent to the v. hemiazygos and is covered 

 by the }>leura mediastinalis (and is accordingly in dii'ect contact with the cavum pleurae); on 

 the riglit side it adjoins th(> ductus thoracicus and the v. azygos, above also the oesophagus, 

 which I'urther down lies on its anterior surface; in front it comes into relation also with the 

 bronchus sinister and with the pericardium in the region of the left atrium. It gives off branches 

 to the thoracic viscera, rami viscerales, and to the waUs of the thorax, rami parietales. 



