ARTERIAL SYSTEM. 593 
‘cling to the walls of the capillaries, and may indeed pass 
through them (diapedesis). 
The arterial system.—Each branch of the truncus arteri- 
osus is triple, and divides into three arches :— 
Fic. 321.—Venous system of frog. - 
m., 1., Mandibular and lingual ; ¢.7., external jugular 3 2.7., internal 
jugular ; scf., subscapular ; z7., innominate ; sc/., subclavian; 
ér., brachial; m.c., musculo-cutaneous; %.v., hepatic vein; 
4.p., hepatic portal; @.a., anterior abdominal; ~4., renal- 
portal ; 4.v., pelvic; sc., sciatic ; 4, femoral ; z.v.¢., inferior vena 
Cava; ¢., cardiac vein. 
I. The carotid arch, the most anterior, corresponding to 
the first efferent branchial of the tadpole, gives off— 
A lingual artery to the tongue ; 
A carotid artery, which bears near the origin of the lingual a 
spongy swelling (the ‘‘carotid gland”), and gives off an 
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