806 THE VAMULAR HYtiTEMS 



drain into the superficial efferents of the lung, while the lymphatics of the parietal 

 pleura have three modes of ending viz. : (a) those of the costal portion join 

 the lymphatics of the Internal intercostal muscles and so reach the internal 

 mammary nodes; (b) those of the diaphragmatic part are drained by the efferent s 

 of the Diaphragm; while (c) those of the mediastinal portion terminate in the 

 posterior mediastinal nodes. 



The lymphatic vessels of the thymus gland terminate in the superior medias- 

 tinal, tracheobronchial, and internal mammary nodes. 



The lymphatic vessels of the oesophagus form a plexus around that tube, the 

 collecting vessels from which drain into the posterior mediastinal nodes. 



