352 SPECIAL ANATOMY. 



between the mm. intercostales ; they send their vasa efferentia into ductus 

 tho rations and 



2. Gl. mediastince posteriores (eight to twelve). They are placed along the 

 aorta thoracica and oesophagus, receiving the lymphatics of the oesophagus 

 and pericardium. 



3. Substernales, they pass along the art. mammaria interna, one in each in- 

 tercostal space, close to the sternum. 



4. Gl. mediastince anterior es are placed, partly (three to four) upon the dia- 

 phragm before the pericardium, partly (eight to ten) round about the arcus 

 aort., ven. cava superior and innominata at the basis cordis. Their vasa 

 afferent, come from the convex surface of the liver, the diaphragm, peri- 

 cardium, the thymus. 



b. Lymphatics: 



1. Plexus intercostales consists of the deep lymphatics along the artt. and 

 vv. intercostales, receive the lymphatics of the vertebral columns, pass 

 through gl. i?/.tercostales and mediastin. poster., and into the duct, thora- 

 cicus. They have roots in the mm. intercost. and pleura costalis. 



2. PI. mammarius internus. The lymphatics of the superior half of the an- 

 terior abdominal walls ascend behind proc. ensiform., united with those 

 on the external surface, by means of the gl. substernales as high upwards 

 as the gl. cervicales inferiores, and into the ductus thoracicus and truncus 

 lymph, dexter. 



3. The lymphatics of the diaphragm pass to the pi. intercost. and hepatic. 

 and to the gl. substernales. 



4. Of the Thoracic viscera: a. The lymphatic glands. Glandules bronchi- 

 ales s. Vesaliance (twenty to thirty, larger) are situated along the bronchi 

 and their point of bifurcation, the largest usually at the division of trachea, 

 the smallest (gl. pulmonares) penetrate the substance of the lungs. In 

 youth yellowish white, they become in time (from the tenth year onwards) 

 darker, blue and black, and readily ossify. 



b. Lymphatics of the lungs. The superficial form beneath the pleura a 

 close rete and pass, generally inwards to the gl. bronchiales at the roots of the 

 lungs. The deep arise from the lobes of the lungs and pass to gl. bronchial. 

 and gl. o3sophagecB. Vasa efferentia of the bronchial glands pass to gl. trachea- 

 les and cesophag. and with these into the ductus thoracicus and trunc. lymphatic, 

 dexter.; several also into v. jugularis interna. 



c. Lymphatics of the heart. The superficial, beneath the membr. serosa, 

 generally pass on the right border ; the deep arise from the internal membrane 

 of the heart; they pass with the last from the pericardium, and sink into the 

 pi. aorticus before aorta and art. pulmon., and into the ductus thoracicus. The 

 lymphatics of the thymus gland and pericardium pass into the gl. substernales, 

 mediastin. anteriores and bronchiales. 



5. Of the head and neck. a. lymphatic glands of the head. 

 1. Glandules subauriculares, under and behind the auricle, behind the in- 

 sertion of TO. sterno-cleido-mastoid.; they are, like the rest (gl. mastoideoe, 



