1004 



THE VASCULAR SYSTEM. 



The Superficial Lymph Vessels of the Neck. The majority of the lymph vessels from the 

 skin and the subcutaneous tissues of the upper part of the neck pass to the" inferior deep cervical 

 glands, but some end in the occipital glands and others in the superior deep cervical glands. 



The superficial lymph channels of the lower part of the neck terminate in the axillary glands. 



The Lymph Vessels of the Eyelids and the Conjunctiva. The lymph vessels which 

 drain the region of the eyelids and the conjunctiva form two groups, a medial and a lateral, 

 (a) The medial vessels pass from the superficial and deeper parts of the medial portions of the 

 superior and inferior eyelids and, following the course of the angular and the external maxillary 

 arteries, they pass to the submaxillary lymph glands. The more superficial vessels lie anterior, 

 and the deeper vessels posterior to the orbicularis oculi. Both groups may be connected with 

 infra-orbital and the anterior buccinator glands. (6) The lymph vessels from the lateral parts 

 of the eyelids pass posteriorly, along the line of the transverse facial artery. They end in the 

 anterior auricular and the parotid lymph glands. In some cases they become connected also 

 with the buccinator and superficial cervical glands. 



Lymph Vessels of the Eyeball. It is doubtful if any true lymph vessels exist in the eyeball. 

 Lymph spaces have been described in association with the coats of the eyeball, and lymph 

 vessels are stated to exist in the chorioid coat, but their existence is uncertain. The sinus venosus 

 sclerae (Schlemm), formerly looked upon as a lymph channel, is probably a venous canal. If 

 lymph vessels are absent then the fluids in the tissues and spaces of the eye must pass into 



Vallate papillae 



IStyloglossus 



Stylo-hyoid 



Superficial lymph ^to*. i^ IP II 111' " \ ^WE^HB^VqM4 > . Digastric 



vessels of side and 

 dorsura of tongue 



Lymph vessels 



of apex of 



tongue 



Afferents to 



mandibular 



glands 



Sublingual gland 



Submental gland 

 Mylo-hyoid cut 



Afferent to deep cervical glands 

 Anterior belly of digastric (cut) 



Afferents to 

 deep cervical 

 glands from 

 posterior third 

 of tongue 



" Common facial vein 



Upper deep cervical 

 lymph glands 



Omo-hyoid f~~ 



FIG. 802. LYMPH VESSELS OF THE TONGUE. 



the capillaries of the veins, unless channels exist in the adventitia of the vessels similar to those' 

 described by Bruce in the spinal medulla. 



The Lymph Vessels of the Ear. The lymph vessels from the upper and lateral parts of 

 the auricle end in the anterior auricular glands. Those from the lower part of the auricle go 

 to the upper superficial cervical glands. The lymph channels from the medial surface of the 

 auricle end in the posterior auricular glands, but in a few cases they establish direct communica- 

 tion with the superior deep cervical glands. 



The lymph vessels of the external acoustic meatus end in the anterior and posterior auricular 

 glands. 



The lymph vessels of the middle ear pass in two directions. Those from the more laterally 

 situated parts of the walls of the cavity join the vessels of the external acoustic meatus and 

 terminate in the posterior auricular glands. The lymph vessels which drain the more medial 

 parts of the middle ear and the auditory tube terminate in the lateral retro-pharyngeal glands. 



It is doubtful if any lymph vessels exist in the internal ear. It is possible that the 

 perilymph drains into the subarachnoid space of the posterior fossa of the skull along the line 

 of the ductus endolymphaticus and that the endolymph reaches the subarachnoid space along 

 the fibres of the acoustic nerve. 



The Lymph Vessels of the Nose. The lymph vessels from the external part of the nose 

 form two groups, superior and inferior. The superior group accompany the vessels from the 

 lateral parts of the eyelids and end in the anterior auricular glands. The inferior group 

 accompanies the angular and the external maxillary arteries, and the majority of the vessels end 



