374 



THE FROG. PHYLUM CHORDATA 



Pulmocutaneous arch 



Cutaneous 



the generative organs, and a small median posterior mesenteric 

 artery to the rectum, after which it divides into two iliac arteries 

 to the legs and abdominal muscles. 



The blood from the lungs is returned by the right and left 

 pulmonary veins, through a short common pulmonary vein to 

 the left auricle. From the rest of the body the blood is returned 



to the sinus venosus by 

 three large veins, the 

 right and left superior 

 or anterior venae cavse 

 or precaval veins in 

 front, and the median 

 inferior or posterior 

 vena cava or postcaval 

 vein behind. Each pre- 

 caval is formed by the 

 junction of three veins, 

 the external jugular, 

 innominate, and sub- 

 clavian. The external 

 jugular is fed by a lin- 



Palatine- 



- External carotid. 

 Jnternal carotid- 

 Carotid Labyrinth . 



Carotid arch 



Sj/sterriLC arch 



Oesophageal- 



'/ — Occcpctai. 



^l/erCebrai. 



Subclanan. 



Dorsal- 

 aorta ■ 



Spermatic 



Benab 



Coelcacomes enteric . 

 Hepatic . 

 Gastric, 



CoeLiac. 



■Mesenteric. 



'^N^*— — SpLenic. 



I x^ \^ Anterior - 

 \ \mesenterLC . 



Posterior mesenteric. 



Haemorrhoidal- 



llcac . 



Hypogastric. 

 Sciatic. 



Peroneal. 



Fig. 



gual vein from the floor 

 of the mouth and a 

 mandibular from the 

 lower jaw. The inno- 

 minate arises by the 

 junction of an internal 

 jugular from the head 

 and a subscapular from 



291.— A diagram of the arterial system of the shoulder and back 

 the frog, seen from the ventral side. - . 



01 the arm. ihe sub- 

 clavian receives the brachial from the arm and the great mus- 

 culocutaneous from the skin, the mucous membrane of the 

 mouth, and many head and trunk muscles. The inferior vena 

 cava arises by the junction of several renal veins from the kidneys 

 and ovarian or spermatic veins from the generative organs, and, 

 just before it enters the sinus, is joined by two hepatic veins from 

 the hver. Blood is returned from the legs by a femoral vein on 

 the outside and a sciatic on the inside of each hmb. Each femoral 

 'n divides on reaching the trunk into a renal portal and a pelvic, 

 former receives the sciatic and runs to the kidney, just before 



