MAMMALS 



499 



Figs. 657 to 662. — The Carotid Circulation in Mammals 

 (after Daniel et al., 1953). 



Fig. 657.— The rabbit. 



k J<i 



Fig. 660.— Tlie pig. 



Fig. 661.— The sheep. 



'I .k 4 



Fig. 659.— The cat. 



Fig. 662.— The ox. 



a, arteria aiiastoniotica ; h, anterior cerebral artery ; c, ascending pharyn- 

 geal artery ; (/, ciliary artery ; e, common carotid artery ; /, carotid rete ; 

 g, circle of Willis ; h, external carotid artery ; i, external ethmoidal artery ; 

 j, external ophthalmic arteiy ; k, frontal artery ; /, internal carotid artery ; 

 //(, internal ethmoidal artery ; n, internal maxillary artery ; o, internal 

 ophthalmic artery ; p, lacrimal artery ; q, middle cerebral artery ; r, arteries 

 of extrinsic ocular muscles ; .s, posterior communicating artery and jDroximal 

 part of posterior cerebral artery ; t, ramus anastomoticus. 



large that the intra-ocular circulation can be maintained unimpaired 

 either by the external or internal ophthalmic arteries (Ellenberger and 

 Baum, 1891 ; Henderson, 1903 ; Parsons, 1903 ; Jewell, 1952 ; 

 Daniel et al., 1953). It is interesting that in association with this 

 anastomotic vessel there is a relatively simple arterial network (the 



