686 



ANGIOLOGY 



large part of that which flows through the thoracic duct. The gall-bladder and bile 

 ducts have rich subepithehal plexuses and the former a subserous plexus. 



The spleen has a rich subserous set and a capsular set of lymphatic capillaries. 

 Iheir presence in the parenchyma is uncertain. 



FIG. 595. Lymph capillaries of the cutis from the inner border of the sole of the human foot, a, a, outer layer; 

 b, b, inner layer. X 30 dia. (Teichmann.) 



The nasal cavity has extensive capillary plexuses in the mucosa and submucosa. 



The trachea and bronchi have plexuses in the mucosa and submucosa but the 

 smaller bronchi have only a single layer. The capillaries do not extend to the 

 air-cells. The plexuses around the smaller bronchi connect with the rich subserous 

 plexus of the lungs in places where the veins reach the surface. 



FIG. 596. Vertical section through human tongue; a, a, blind lymph capillaries in the filiform papillae with the under- 

 lying lymphatic plexus. X 45. (Teichmann.) 



Lymphatics have been described in the thyroid gland and in the thymus. 



The adrenal has a superficial plexus divided into two layers, one in the loose tissue 

 about the gland and the other beneath the capsule. Capillaries have also been 

 described within the parenchyma. 



