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 : 



l 



FIG. 321. Venous system of frog. 



Mr., /., Mandibular and lingual ; e.j.> external jugular ; /./I, internal 

 jugular; scp.^ subscapular ; *., innominate; scl., subclavian; 

 br.) brachial ; m.c., musculo-cutaneous ; h.v. y hepatic vein J 

 h.p., hepatic portal; a.a., anterior abdominal; r.p.^ renal- 

 portal ;/.z>., pelvic ;sc., sciatic ;./, femoral ; i.v.c., inferior vena 

 cava ; c. t 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 



