LYMPHATICS OF THE TRUNK. 351 



phatics of the lower extremity and those of the trunk. The other 

 efferent vessels pierce the fascia lata to join the deep glands. The 

 vessels which pass upwards from the outer side of the dorsum of the 

 foot, ascend upon the outer side of the leg, and curve inwards just 

 below the knee, to unite with the lymphatics of the inner side of the 

 thigh. The external group consists of a few lymphatic vessels which 

 commence upon the outer side of the foot and posterior part of the 

 ankle, and accompany the external saphenous vein to the popliteal 

 region, where they enter the popliteal glands. 



The Deep lymphatic vessels accompany the deep veins, and com- 

 municate with the various glands in their course. After joining the 

 deep inguinal glands they pass beneath Poupart's ligament, to com- 

 municate with the numerous glands situated around the iliac vessels. 

 The deep lymphatics of the gluteal region follow the course of the 

 branches of the gluteal and ischiatic arteries. The former join the 

 glands situated upon the upper border of the pyriformis muscle, and 

 the latter after communicating with the lymphatics of the thigh, 

 enter the ischiatic glands. 



LYMPHATICS OF THE TRUNK. 



The lymphatics of the trunk may be arranged under three heads, 

 superficial, deep, and visceral. 



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 lymphatics from the mammary glands follow the lower border 

 of the pectoralis major, communicating by means of a chain of 

 lymphatic glands, with the axillary glands. The superficial lymph- 

 atic vessels of the lower half of the trunk, of the gluteal region, 

 perineum, and external organs of generation, converge to the supe- 

 rior group of superficial inguinal glands. Some small glands are 

 situated on each side of the dorsal vein of the penis, near to 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, in- 

 ternal mammary, anterior mediastinal, and posterior mediastinal. 



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

 side of the vertebral column, near to 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 cellular 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 ossophagus in the posterior mediastinum, and com- 





