46 



allows these two arteries to leave the central cavity of the 

 brain, through which they pass posteriorly, and gain the 

 ventral surface of the buccal mass, over which they run 

 obliquely (fig. 42, C.A.). At the anterior end of this 

 mass, each cephalic artery divides again. A second 

 division of these four branches now gives the eight 

 brachial arteries (fig. 42, Arm. A.) which supply the 

 arms. 



Each brachial artery runs down the centre of the arm. 

 external and closely applied to the brachial nerve 

 (PL VIII, tig. SO). Externally it gives off a series of 

 small arteries all along the arm, to the muscles and skin 

 of the external surface of the arm, and to the web 

 (PI. Till, fig. 79). Internally the brachial artery 

 furnishes two branches to each sucker (fig. 79, S. a.). 

 These run up one on each side of the corresponding nerve 

 ganglion, and penetrating the muscles of the arm, end in 

 superficial small branches on the sucker and internal 

 surface of the arm. The brachial artery extends to the 

 tip of the arm, its size decreasing with the corresponding- 

 lessening of that organ towards the tip. 



Although the anterior and posterior salivary glands 

 are widely separated from one another, yet their arteries 

 have a common origin. Soon after its bifurcation, the 

 anterior aorta gives off two branches, one from each fork 

 (fig. 42). Each branch immediately divides again, one 

 artery running posteriorly to the corresponding posterior 

 salivary gland, which it enters anteriorly (fig. 42, S t A t ), 

 and one branch (the pharyngeal artery, fig. 42, Ph. A.) 

 running anteriorly to the buccal mass. 



The pharyngeal arteries run forwards, one on each 

 side of the oesophagus, through the cranial cavity, and 

 emerging with the oesophagus reach the buccal mass. 

 Here each artery runs below the sub-oesophageal 



