574 



AMPHIBIA. 



II. 



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 external carotid to the mouth and the 

 orbit, and an internal carotid to the brain. ' 

 The systemic arch, the median one of the three, 

 corresponding to the second efferent branchial in the 

 tadpole, gives off 



The laryngeal artery to the larynx ; 

 The cesophageal to the oesophagus ; 

 The occipito-vertebral to the head and vertebral column ; 

 The subclavian or brachial to the fore-limb. 

 From the left aortic arch, just as it unites with its fellow 

 of the other side to form the dorsal aorta, or from the begin- 

 ning of the dorsal aorta, there is given off the cceliaco- 

 mesenteric to the stomach, intestine, liver, and spleen. 

 Further back the dorsal aorta gives off 



The renal arteries to the kidneys, and the genital 



arteries to the reproductive organs ; 

 The inferior mesenteric to the large intestine. 

 Then it divides into two iliacs, each of which supplies 

 the bladder (hypogastric), the ventral body-wall (epigastric), 

 and the leg (sciatic). 



III. The pulmocutaneous arch, the most posterior, 

 corresponding to the fourth efferent branchial in the 

 tadpole, gives off 



The cutaneous artery to the skin ; 

 The pulmonary artery to the lungs. 



The venous system. --I. Each superior vena cava is 

 formed from the union of three veins, and each of these 

 three is formed from two smaller vessels. 



Lingual from the mouth and 



Superior 

 vena cava. 



External 





* & iMandibular from the lower jaw. 



'Internal jugular from the inside of 



the skull. 



Subscapular from the back of the 

 . arm and the shoulder. 

 Brachial from the arm. 

 Musculo-cutaneous from the skin 

 . and sides of the body. 



Innominate. 



Subclavian. 



