THE NECK, ANTERIOR. 107 



It furnishes filaments to the thyroid gland and gives off* 

 the middle cardiac nerve, which passes into the thorax to 

 end in the deep cardiac plexus, and is connected to the fifth 

 and sixth cervical nerves. 



The Inferior Cervical Ganglion. 



This ganglion lies behind the vertebral artery, and be- 

 tween the neck of the first rib and the transverse process 

 of the seventh cervical vertebra. 



Its filaments extend to the seventh and eighth cervical 

 nerves, to the vertebral artery, and by the inferior cardiac 

 nerve to the deep cardiac plexus. 



DISSECTION. 



Divide the internal carotid near its bifurcation and retract the two portions. 



Ligate the subclavian vein at the clavicle (if the axillary has already been 

 tied, then draw the vein under the clavicle) and turn it inward. Keep track 

 of the thoracic duct on the left side. 



Divide the scalenus anticus over the subclavian artery and clean the entire 

 course (in the neck) of the artery and its branches. 



The Right Lymphatic Duct. 



Receives the lymphatics of the right side of the head 

 and neck, right upper extremity, right side of the thorax, 

 and from the convex surface of the liver. It is about an 

 inch long and empties into the angle between the internal 

 jugular and subclavian as they form the right innominate 

 vein. 



The Thoracic Duct. See Thorax, page 344. 



The Subclavian Artery. Figs. 17, 18. 



The subclavian artery differs in its origin on the two sides 

 of the body. On the right side it is the external branch 

 of bifurcation of the innominate artery ; on the left side, 

 arises as the last branch from the transverse portion of the 

 aorta. 



