644 THE LYMPHATICS. 



they are provided on their course with several elongated glands, to which 

 the lymphatic radicles that arise from the cervical portion of the trachea 

 and oesophagus pass. On arriving near the entrance to the chest, they are 

 lost in the°prepectoral glands. Some of them, however, traverse these 

 ■without dividing, and directly enter, on the left, the thoracic duct, and on 

 the right, the great lymphatic vein. It has been even possible for us to 

 inject the latter vessel by one of these canals exposed on the right side. 



3. Submaxillary or Subglossal Glands. ' 



They represent a fusiform mass situated at the bottom of the inter- 

 maxillary space, in the receding angle comprised between the digastricus 

 on the one side, and the mylo-hyoideus and subscapulo-hyoideus muscles on 

 the other, above and near to the external maxillary artery. The lymphatics 

 of the tongue, cheeks, lips, nostrils, and nasal cavities join these glands. 

 Their efferents reach the pharyngeal or guttural glands. 



4. Prescapular Glands. 



By their union they form a species of chain, at least twelve inches in 

 length, placed on the course of the ascending branch of the inferior cervical 

 artery, beneath the internal face of the levator humeri muscle, and descend- 

 ing close by the fixed insertion of the sterno-maxillaris muscle. 



The majority of the lymphatics of the neck, and those of the breast and 

 shoulder, open into these glands. Their eflerents, shoi-t and voluminous, 

 enter the prepectoral glands. 



5. Brachial Glands. 



Situated beneath the anterior limb, within the arm, these vessels are 

 divided into two groups : one placed near the ulnar articulation, within the 

 inferior extremity of the humerus ; the other disposed in a discoid mass 

 behind the brachial vessels, near the common insertion of the adductor 

 muscle of the arm and the great dorsal muscle. 



The first group receives the vessels from the foot and the fore-arm, 

 which accompany the superficial veins, or pass with the deep arteries and 

 veins into the muscular interstices. It sends nine or ten flexuous branches 

 to the second group, into which open directly the lymphatics of the arm 

 and shoulder, and from which emerge a certain number of efferents that 

 pass, in company with the axillary vessels, to the prepectoral glands. 



Aetiole III. — Geeat Lvmphatio Vein. 



The second large receptive trunk of the lymphatic vessels, this great 

 vein (the ductus lymphaticus dea/er) leaves the prepectoral glands of the right 

 side, and therefore becomes the general confluent of the lymphatics from 

 the right anterior limb, the right axillary and superficial costal regions, 

 as well as the right half of the head, neck, and diaphragm. 



This trunk is only from three-fourths of an inch to two inches in length. 

 " It usually opens at the junction of the jugulars, at the side of the canal, 

 by an orifice furnished with a double semilunar valve. Sometimes one or 

 two of the branches which concur to form it describe circumvolutions around 

 the corresponding brachial trunks or some of its divisions, before joining 

 the others. Lastly, it is not rare to see this lymphatic trunk anastomose 



