LYMPHATICS OF THE TRUNK. 393 



The Superficial lymphatic vessels of the upper half of the trunk pass 

 upwards and outwards on each side, and converge, some to the axillary 

 glands, and others to the glands at the root of the neck. The lym- 

 phatics from the mammary glands follow the lower border of the pec- 

 toralis major, communicating, by means of a chain of lymphatic glands, 

 with the axillary glands. The superficial lymphatic vessels of the lower 

 half of the trunk, of the gluteal region, perineum, and external organs 

 of generation, converge to the superior group of superficial inguinal 

 glands. Some small glands are situated on each side of the dorsal 

 vein of the penis, near the suspensory ligament; from these, as from 

 the superficial lymphatics, the efferent vessels pass into the superior 

 group of superficial inguinal glands. 



The Deep lymphatic glands of the thorax are the intercostal, internal 

 mammary, anterior mediastinal, and posterior mediastinal. 



The Intercostal glands are of small size, and are situated on each 

 side of the vertebral column, near the articulations of the heads of 

 the ribs, and in the course of the intercostal arteries. 



The Internal mammary glands also very small, are placed in the 

 intercostal spaces, by the side of the internal mammary arteries. 



The Anterior mediastinal glands occupy the loose areolar tissue of 

 the anterior mediastinum, resting some on the diaphragm, but the 

 greater number upon the large vessels at the root of the heart. 



The Posterior mediastinal glands are situated along the course of the 

 aorta and oesophagus in the posterior mediastinum, and Communicate 

 above with the deep cervical glands, on each side with the intercostal 

 and below with the abdominal glands. 



The Deep lymphatic vessels of the tlwax are the intercostal, internal 

 mammary, and diaphragmatic. 



The Intercostal lymphatic vessels follow the course of the arteries of 

 the same name; and reaching the vertebral column curve downwards, 

 to terminate in the thoracic duct. 



The Internal mammary lymphatics commence in the parietes of the 

 abdomen, communicating with the epigastric lymphatics. They as- 

 cend by the side of the internal mammary vessels, being joined in their 

 course by the anterior intercostals, and terminate at the root of the 

 neck, on the right side in the tributaries of the ductus lymphaticus 

 dexter, and on the left in the thoracic duct. The diaphragmatic lym- 

 phatics pursue the direction of their corresponding veins, and terminate 

 some in front in the internal mammary vessels, and some behind, in the 

 posterior mediastinal lymphatics. 



The Deep lymphatic glands of the abdomen are the lumbar glands; 

 they are very numerous, and are seated around the common iliac vessels, 

 the aorta and vena cava. 



The deep lymphatic glands of the pelvis are the external iliac, inter- 

 nal iliac and sacral. 



The External iliac are placed around the external iliac vessels, being 

 in continuation by one extremity with the femoral lymphatics, and by 

 the other with the lumbar glands. 



