472 Anatomy Applied to Medicine and Surgery. 



muscles, and the subclavian artery. Below, the deep fas- 

 cia, as already mentioned, is attached to the upper border 

 of the sternum and the clavicle; whereas, the anterior 

 transverse partition, i.e., the pretracheal fascia, follows 

 down in front of the trachea to become continuous with 

 the pericardium, while the posterior partition, or preverte- 

 bral fascia, is continued down into the thorax covering the 

 vertebrae and the muscles of the posterior mediastinum, 

 and, where the deep fascia covers the subclavian artery a 

 procesiS of it is prolonged down into the axilla, over the 

 artery. The spaces enclosed between these partitions, 

 communicate with the mediastina in the following man- 

 ner, viz. : The space, bounded in front, by the deep fascia 

 proper, and, behind, by the pretracheal fascia, communi- 

 cates with the anterior mediastinum. That, between the 

 pretracheal and the prevertebral layers communicates with 

 the middle and posterior mediastina, while the space be- 

 hind the prevertebral layer communicates with the pos- 

 terior mediastinum, or properly speaking, lies behind this 

 mediastinum. 



Lymphatic Glands. Some of the superficial lymphatic 

 glands of the neck are situated along the course of the 

 external jugular vein, immediately beneath the deep fas- 

 cia, and receive lymphatic vessels from the neighborhood 

 of the ear and from the occipital region, and hence this 

 chain of glands may be enlarged in inflammatory pro- 

 cesses 'affecting either of these regions. Other super- 

 ficial glands are situated beneath the ear, or in the sub- 

 maxillary triangle, and their lymphatics are tributaries of 

 the first set. The deep lymphatic glands, which extend 

 along the course of the internal jugular vein, are divided 

 into an upper and a lower set. These deep glands receive 

 lymphatic vessels from the superficial chain and from the 

 glands around the pharynx, and drain, therefore, the re- 



