THE ARTERIAL SYSTEM. 



573 



the veins. The red corpuscles are swept along most rapidly, 

 and are often deformed by pressure ; the leucocytes tend to 

 cling to the walls of the capillaries, and may indeed pass 

 through them (diapedesis). 



I. 



FlG. 280. Venous system of frog. 



in. I., Mandibular and lingual ; e./., external jugular ; /./. , internal 

 jugular; scj>., subscapular ; in., innominate; scL, subclavian ; 

 br., brachial ; m.c., musculo-cutaneous ; /i.v., hepatic vein; 

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

 portal ;/.'., pelvic ; sc., sciatic ; f., femoral ; i.v.c., inferior vena 

 cava ; c. , cardiac vein. 



The arterial system. Each branch of the truncus arteri- 

 osus is triple, and divides into the following on each side :- 



I. The carotid arch, the most anterior, corresponding to 

 the first efferent branchial of the tadpole, gives off- 



