A b'FL UEX TS OF THE TUUHA CIC D I < I C, I :i 



duct or the great lymphatic vein, the majority of them through the medium 

 of the prepeotoral glands. These vessels receive, on their course, those 

 which are brought fnun the inferior part of the intercostal spaces into the 

 supr.-i Denial LTi-a mi hit ions. 



Tlu- other lyni])hatic vessels of the costal wall ascend between the two 



muscles which close these spaces, and go to the subdorsal glands, which 



aids eject them, near the origin of the thoracic duct, in the form of 



r two long vessels proceeding in a retrograde manner on each side of 



the dorsal column. 



LYMPHATIC VESSELS OF THE HEAD, NECK, AND ANTERIOB LIMB. 



These vessels are all directed towards the entrance to the chest, and are 

 gathered into a group of glands, called the prepectoral, which, with regard 

 to the lymphatics of the anterior part of the body, play the same part as 

 the sublumbar glands do to the vessels of the posterior region. 



Before arriving at this common point of convergence, they are inter- 

 cepted on their course by other glands, which form four principal groups : 

 1, The ijiitfiti-nl or i>lianjngeal glands; 2, The submaxillary glands; 3, The 

 prescnjiiilar glunds ; 4, The brachial gLinds. 



In studying these different glandular groups in succession, with their 

 afferent and eiferent vessels, we will give a sufficient idea of the entire 

 lymphatic apparatus in the region which remains for us to examine. 



1. Prepectoral Glands. 1 



They form, on each side of the terminal extremity of the jugular, within 

 the inferior border of the scalenus muscle, a very large mass which extends 

 into the chest by passing beneath the axillary vessels, and ascends to the 

 inner face of the first rib. 



Into these glands pass the lymphatic vessels emerging from the pre- 

 scapular and axillary glands, those which descend along the trachea with 

 the common carotid, and which come from the pharyngeal glands, as well 

 as the majority of those which follow the internal thoracic vessels. 



They give rise to several short and voluminous branches : those from 

 the glands of the right side form, by their junction, the great lymphatic 

 vein ; and those from the left side join the thoracic duct, or are inserted 

 separately beside the latter, at the summit of the anterior vena cava. 



2. Pharyngeal Glands. 



Very numerous, soft, and loosely united to one another, these glands are 

 disposed in an elongated mass that occupies the lateral plane of the pharynx, 

 w the guttural pouch, and which is prolonged backwards oven beyond 

 the thyroid body. 



They receive all the lymphatics from the head : some come directly 

 from tin base of the tongue, the soft palate, the pliaryjig* -al walls, and the 

 iiers are derived from the snbmaxillary glands, and from a 

 lobi:l .11 the substance of the parotid gland. 



nt branches which leave it are four or five in number. 



luminous, they descend along the trachea, some separately, but 



the majority are united in a fasciculus which follows the carotid artery; 



we believe, \\liidi ought to bo regarded as the repreaentativ 



llary flu i nl* <!' M 



9*9 



