LYMPHATICS OF NASAL CAVITIES 



717 



(3) The basal vessels are seven or eight in number, and drain the basal portion of the tongue. 

 Some end in the large node just mentioned, while others run backward close to the median 

 line, where they anastomose, as far as the glosso-epiglottidean fold, when they separate and 

 join the tonsillar vessels to pass outward to the superior deep cervical nodes. 



(4) The central vessels, arising from the central portion of the tongue, pass backward in 

 the median line on the ventral surface of the tongue. They lie upon the mylo-hyoid muscle, 

 cross the hyoid bone, and end in the superior deep cervical chain. 



The lymphatics of the palate. — The lymphatics from the palate pass to the 

 deep cervical chain. The trunks from the hard palate run in the submucosa as 

 far as the last molar tooth, where they pass in front of the anterior pillars of the 

 fauces and end in the superior deep cervical nodes beneath the digastric muscle 

 In the soft palate the capillary plexus is very rich, reaching a maximum in the 

 uvula. From the inferior surface of the soft palate and the pillars of the fauces 

 vessels pass directly to the superior deep cervical chain, but some of the vessels 



Fig. 562. — The Lymph.\tics of the CoNJUNCTrvA. (After Teichmann.) 



from the upper surface of the soft palate run forward with the pharyngeal vessels 

 and end in the retro-pharyngeal nodes. It will be seen from fig. 564 that the retro- 

 pharyngeal nodes are simply outlying nodes from the deep cervical chain. 



The lymphatics of the pharynx. — As has just been stated, there are certain 

 outlying nodes of the deep cervical chain which lie behind the pharynx. They 

 receive some of the ducts from the submucosa of the roof of the pharynx, but many 

 of the pharyngeal vessels pass by these nodes and end directly in the superior deep 

 chain. The tonsil is especially rich in lymphatics, and its ducts, together with 

 those from the middle and inferior portions of the pharynx, end in the superior 

 deep cervical chain. The lymphatics of the Eustachian tube run to the lateral 

 retro-pharyngeal lymph-nodes or, passing these, to the deep cervical nodes. 



The lymphatics of the nasal cavities. — -The mucous membrane of the nose 

 contains a rich lymphatic plexus whose main ducts pass to the retro-pharyngeal 

 nodes. An anterior set, however, anastomoses with the subcutaneous vessels, 

 and through these their lymph is conveyed to the facial and submaxillary nodes. 

 The posterior vessels run either to the deep cervical chain or to the retro-phar3'n- 

 geal nodes. Key and Retzius have shown that an injection of the lymphatics of 

 the nose may be made by injecting the subarachnoid spaces at the base of the 



