Vascular System of the 'J'liyroid Gland. 



483 



ing the upper poles of the gland, and the inferior thyroid arteries ap- 

 proaching from beneath. Each artery gives off four or five branches, 

 some of which supply the anterior, some the posterior surface of the 

 gland. The main continuations of these arteries are prone to run 

 along and upon the margins of the gland, and the superior and in- 



FiG. 4. — Drawing illustrating tlie venous networl 

 human thyroid with accompanying arteries. 

 A.— Arteries. V. — Veins. 



upon the surface of 



ferior thyroid arteries upon the same sides anastomose, two anas- 

 tomoses occurring between each artery in the specimen from which 



