138 LYMPHATIC SYSTEM. 



which were not injected, and therefore are not represented in 

 that plate. 



Near the spleen, liver, kidneys, and renal capsules, there are 

 also lymphatic glands which belong to the lymphatic vessels of 

 these organs. 



There are likewise lymphatic glands sometimes observed by 

 the sides of the thoracic duct, particularly about the middle of 

 the thorax, which glands belong principally to the vessels of 

 the lungs. 



There are also many lymphatic glands (called bronchial) 

 near the root of the lungs ; these glands are placed upon the 

 lymphatic vessels, just where they quit the lungs. But no 

 lymphatic glands have yet been observed in the substance of 

 the lungs, and the tubercles (LXV) which some suspect to be 

 obstructed lymphatic glands, seem to have a different origin. 

 There are likewise some glands seen on the lymphatic vessels 

 which lie near the subclavian veins at the upper part of the 

 thorax, and which belong to the fore part of the lungs. 



Besides these there are some lymphatic glands upon the 

 aorta near the oesophagus, and there are also others occasionally 

 met with in the intercostal spaces, and there are generally two 

 or three contiguous to the thoracic duct at the lower part of 

 the neck and upper part of the thorax, near the termination of 

 that duct, in the angle between the left jugular and the left sub- 

 clavian vein. 



Having thus traced the lymphatic system in all parts of the 

 body that are below the termination of the thoracic duct, I 

 shall next examine that part of it which lies upon the head, 

 neck, and upper extremities, where the tracing it is attended 

 with greater difficulties. 



By the side of each internal jugular vein is a large lymphatic 

 vessel, which is the trunk of those of one side -of the head and 

 neck ; that of the right side is seen Plate III /. There are 

 likewise smaller lymphatics which are seen near the branches 

 of the external carotid artery. There are also lymphatic glands 



(LXV.) In pulmonary consumption, the tubercle may be situated 

 either within the air-cells or in the filamentous tissue between and on 

 the outside of them. See my observations in Professor Wagner's Phy- 

 siology, translated by Dr. Willis, p. 360, fig. CLXXV; and in the Edin. 

 Med. and Surg. Journ. Ix, 161. 



