THE ARCH OF THE AORTA 



467 



THE ARCH OF THE AORTA 



The arch of the aorta (fig. 321) begins at the upper and back part of the left 

 ventricle of the heart, Ijehind the sternum, on a level with the lower border of the 

 third left costal cartilage. Thence it passes upwards and slightly forwards and to 

 the right, as high as the level of the upper l)order of the second costal cartilage of 



Fig. 321. — Tjie Akch of the Aorta, with the Pulmonaky Aktkry and Chief 



Branches of the Aorta. 



(From a dissectiou in St. Bartholomew's Hospital Mnseniii.1 

 RTGHT RECUR- 



j;i:xT LA It y.y- 



OEAL SERVE 



Transvise c.rcical 



ailenj 



Right common can I id _- 



ttrtery 

 Suprascapular art i >/ — 



Internal jugular k in — 



PXEUMOOASTPIf - 

 SER VE 

 Subclavian ttin 



Inferior thyroid ifin 



PIIREXIC NER I E 



Left innominate rein — 



Ascending ac> 1 1 



Superior renn cita 



RIGHT BRONCHUS 



Branch to superior I tb 

 of luug 

 Upper branch of ri /hi 



Ijulinonarji arterii 

 Branch to middle lobe 



of lung 

 Right pulmonary vein 



RIGHT AURICLE 



Right coronary arti > 1/ 

 Lower branch nf right 

 pulmonary artery 

 THORACIC VERTEBRA 



Litercostal vein 



Intercostal arleiy 



Vena uzygos major 



Intercostal vein 

 Intercostal artei y 



Intercostal vein 

 Intercostal artery 



THYROID BODY 

 L EFT RECUR Rh X T 

 LARYXGEAL 

 XKRVE 

 I-XEUMOGASTRIC 



XER VE 

 Left internal jugular 



vein 

 Left common carotid 

 urlery 

 ~ Left subclavian artery 



~ Left subclavian vein 



TRACHEA 



~ Inferior thyroid i-ein 



_ PHREXIC XERVE 



( hooked aside) 

 REriRREXT 

 LARYXGEAL 

 XERVE 

 PXEUMOGASTRIC 



XERVE 

 DUCTUS ARTERIOSUS 



Left puhnoiiary artery 



!':ilrnonary artery 



Right pulmonary 

 artery 



LEFT BRONCHUS 



Left coronary artery 



Ujiper left pulmonary 



vein 

 '. GHT VENTRICLE 



' 'onus arteriosvs) 

 I. II er left pulmonary 



artery 

 Loner left pulmonary 



vein 

 ISaPHAGUS 

 (/looked aside) 



THORACIC DUCT 

 Thoracic aorta 



the right side; and then, curvdng backwards, upwards, and to the left, crosses 

 behind the sternum at the level of the middle of the manubrium; and, reaching the 

 left side of the l)ody of the fourth thoracic vertel^ra, runs downwards on the side of 

 the body of that and the fifth thoracic vertebra, at the lower border of which it ter- 

 minates in the thoracic aorta. The arch thus formed has its convexity upwards 

 and to the right; in its concavity are situated the left bronchus and the riglit pul- 

 monary artery. According to its direction, it is somewhat arlntrarily divided into 

 an ascending, transverse, and descending part. jNIorphologically, the ascending 



