THE CERVICAL PLEXUS 127 



anterior group of the deep cervical lymph glands and the 

 cervical dome of the pleura. It crosses the apical pleura, 

 obliquely, medially and backwards, and gains the mediastinal 

 space (Fig. 122). On the left side, the phrenic nerve crosses the 



[Photo by Alinari. 



FIG. 61. The Nerve-supply ol the Anterior Aspect of the Trunk. 



arch of the aorta and the left side of the pericardium, before 

 reaching the diaphragm, to which it is distributed. On the 

 right side, the nerve descends close to the superior vena cava 

 and then crosses the right side of the pericardium. It not 

 only supplies the right half of the diaphragm but some of its 



