4 86 



COLLEGE ZOOLOGY 



carotid to the brain, and the ophthalmic artery to the eye. Where 

 the common carotid branches is a swelling called the carotid 

 gland (Fig. 413 b, A, 7); this body impedes the blood flow 



in the internal carotid 



artery. 



(2) The pulmocutaneous 

 artery (Fig. 413 b, A, /o ; 

 Fig. 414, p.cu) branches, 

 forming the pulmonary 

 artery, which passes to 

 the lungs, and the cutane- 

 ous artery. The latter 

 gives off the auricularis, 

 which is distributed to 

 the lower jaw and neigh- 

 boring parts, the dorsalis, 

 which supplies the skin 



"^ , of the back, and the 

 -/7c 



~ V7t lateralis, which supplies 



-y * 



=- , M~~ u the skin of the sides. 



\ f f I ^*n' Most of these branches 



carry blood to the re- 

 spiratory organs lungs, 

 skin, and mouth. 



(3) The third branches 



3C . /T-" 



~ TV . , or systemic arches (rig. 



FIG. 414. Diagram of the arterial system 



of the frog, ventral view, ao", aortic arch; 413 b, A, 9; Fig. 414, ao") 

 au', right auricle; aw", left auricle; br, brachial 



artery ; c.c, carotid ; c.gl, carotid gland ; 

 c.tt, common iliac ; cce, coeliaco-mesenteric ; 

 CCE', cceliac; cu, cutaneous; d.ao, dorsal aorta; 

 fm, femoral ; g, gastric ; h, hcemorrhoidal ; 

 hp, hepatic; hy, epigastrico-vesical; k, kidney; 

 /, lingual; Ig", left lung; m, anterior mesen- 

 teric; m.i, posterior mesenteric; oc, occipital; 

 pc', pancreatic ; p.cu, pulmocutaneous ; put, 

 pulmonary; re, renal; sc, sciatic; sp, splenic; 

 tr.a, truncus arteriosus; ts, testis; v, vertebral. 

 (From Holmes, after Howes.) 



after passing outward 

 and around the aliment- 

 ary canal unite to form 

 the dorsal aorta (d.ao). 

 As shown in Figure 414, 

 each systemic arch gives 

 off an occipito-vertebral 

 artery, which divides, one 



