LYMPHATICS OF THE UPPER EXTREMITY. 265 



run to the gland, penetrate the cortical portion at all 

 points. The alveoli of the cortical portion are rilled up 

 with interlacing fibres from the septa, forming a plexi- 

 form net-work, and called the alveoli of the alveoli, or 

 secondary alveoli. They are filled up with lymphoid 

 corpuscles, the proper lymph-gland pulp. The medul- 

 lary portion is formed of delicate trabeculae, vessels and 

 cells. The lymphatics are dhided into the superficial 

 and deep. The former run in the superficial fascia; the 

 latter accompany the large blood-vessels. Lymphatics 

 are classified into those, first, of the head and neck; 

 second, of the upper extremity ; third, of the trunk ; 

 fourth, of the lower extremity. 



LYMPHATICS OF THE HEAD AND NECK. 



The lymphatics of the head and neck run in the 

 superficial fascia and converge about the angle of the 

 jaw, where a number of lymphatic glands are found 

 about the course of the vessels. The deep lymphatics 

 from the nose and mouth communicate with the deep 

 lymphatic glands at the sides of the internal jugular vein. 

 The lymphatics of the cranium pass out through the 

 foramina at the base of the skull and enter the deep 

 lymphatic glands. The lymphatics of the neck are divided 

 into the superficial and deep. The former run in the 

 superficial fascia, from the angle of the jaw to the middle 

 of the clavicle. Just above the clavicle numerous glands 

 are found in the groove between the trapezius and the 

 sterno-mastoid. The deep lymphatics of the neck ac- 

 company the carotid artery. They consist of a chain 

 of six or eight glands. 



LYMPHATICS OF THE UPPER EXTREMITY. 



The lymphatics of the upper extremity are divided into 

 the superficial and deep. The former run in the super- 



