652 THE LYMPHATICS 



spaces which surround the olfactory nerves, witli the subdural and subarachnoid 

 lympli-spaci^s of the cranimu. 



5. The lymphatics of the mouth and tongue. — The lymphatics from the 

 floor of the mouth i)ass through the niylo-hyoid muscle into the submaxillary 

 lymphatic glands. The lymphatics of the lips i)ass with the superficial lymphatics, 

 partly into the submaxillary glands, and partly into the deep cervical chain. The 

 lym])hatics of the deep surface of the cheek and of the roof of the mouth join the 

 internal maxillary Ij'mphatic glands. The lymphatics of the tongue run back- 

 wards with the ranine vein, and, after passing through several small lingual glands 

 on the hyo-glossus muscle, join the deep cervical chain. The lymphatics of the 

 front part of the tongue pass with the lymphatics of the floor of the mouth, 

 through the mylo-hyoidean muscles into the submaxillary glands. 



6. The lymphatics of the pharynx run along the course of the pharyngeal 

 arteries and enter the upper set of deep cervical glands. Those from the upper 

 part of the pharynx pass through the i)Ost-pharyngeal gland. The lymphatics of 

 the tonsil open into the submaxillary glands near the angle of the jaw. 



Fig. 398b. — Diagram of the Beep Lymphatic Vessels and Glands of the Head and 

 Neck. (After Drawing ))y Dr. Francis R. Sherwoofl.) 



(Upper and post, part of Tongue 



_ , .,, c , It » interior of Cranium 



Spheno-maxillary Fossa ill t t 



Inner and posterior part of Nose 

 Temporal Fossa 



Orbit >^^ ^y f 2 to 4 — 0«i 9 // y y Upper part of pharynx 



Nose.^ \ \ i jyj // / / 



Deep muscles of neck 

 (prevertebral) 



Upper pari of pharynx and palat 



Internal maxillary glands 3 to 6 



Posterior pharyngeal glands 



Efferent vessels from ^ \ XV \l \ ATrt/ ^.^^f cervical glands 



submaxillary glands 



■ Deep muscles 



OEs 

 Lower part of Thyroid body 



Efferent vessels'to R, and'L' Lymphatic ducts 



7. The lymphatics of the larynx join the deep cervical glands. Those above 

 tlie glottis })ierce the thyro-hyoid membrane, and end in the upper set of the deep 

 cervical glands; those below the glottis perforate the crico-thyroid membrane, and, 

 after passing through one or more small laryngeal glands at the lower part of 

 the larynx on its anterior or lateral asj^ect, enter the lower set of the deep cervical 

 glands. 



8. The lymphatics of the upper part of the oesophagus and trachea join 

 the lower glands of the deep cervical cliain. 



9. The lymphatics of the thyroid body accompany the thyroid arteries, 

 and end in part in the up2:»er and in part in the lower glands of the deep 

 cervical chain. 



B, The Deep Lymphatic Glands of the Head and Neck 



1. The deep lymphatic glands of the head are few in numl)t'r. They are 

 the lingual, the internal maxillary, and the post-))haryngeal. 



(1) The lingual, two to four in iiuml)er, are situated on the outer surface of 



