OF THE ANTERIOR CAVA. 



145 



description of the veins as vessels terminating in the heart ; 

 and bringing the blood to the centre of circulation, to be 

 thence purified. 



FIG 18. 





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THE TERMINATIONS OF THE CAVAS IN THE HEART ; RIGHT SIDE. 



a. The anterior cava. h. The anterior intercostal. 



h. The jugular. i, The inferior cervical, 



c, The vertebral. j, The vena azygos. 



</, The axillary. h. The posterior vena cava, divested of its 



e, The internal pectoral. covering of pleura. 



/, The external pectoral. I, The phrenic sinuses. 

 (7, The dorso cervical. 



The anterior cava empties its contents into the right 

 auricle : opposite to the first rib it receives four principal 

 trunks ; two of which are the axillaries, and two of which 

 are the jugulars ; besides these the internal and external 

 pectorals empty themselves also into the anterior cava, 

 opposite to the first rib {Fig \S . d, e,f). Subsequent to 

 this it receives the dorso cervical and vertebral veins with 

 the anterior intercostal ; then the vena azygos {Fig 18 . j) ; 

 which passes on the right side of the dorsal vertebice, 

 and receives the blood from all the posterior intercostals ; 

 all pour their blood into its channel {Fig 18^. h, g,j, c). 



The axillary is a principal trunk, which, having passed 

 over the first rib, assumes the name of the humeral ; and is 

 joined by the external thoracic or spur vein ; as well as 

 vessels from the scapula and its muscles. 



The humeral descends towards the posterior part of the 

 humerus, where it takes the name of radial ; previous to its 



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