142 



VISION 



II 



SO VII IX 



1 cm 



Figure 17 Dorsal view of the brain of Myliobatis californica, the bat ray (A) and 

 Dasyatis americana, the southern stingray (B). a, anterior lobe of the cerebellum; a , 

 anterior division of the central nucleus of the telencephalon; ar, anterior ramus of the 

 statoacoustic nerve; b, buccal ramus of the anterior lateral-line nerve; c, caudal division of 

 the central nucleus; en, spinal nerve collector ramus; il, inferior lobe of the hypothalamus; 

 lob, lateral division of the olfactory bulb; lp, lateral pallium; m, middle lobe of the 

 cerebellum; mln, mesencephalic lateralis nucleus; mob, medial division of the olfactory 

 bulb; oe, olfactory epithelium; op, olfactory peduncle; ot, optic tectum; p, posterior lobe 

 of the cerebellum; pill, posterior lateral-line lobe; plln, posterior lateral-line nerve; pr, 

 posterior ramus of the statoacoustic nerve; so, superficial ophthalmic rami of anterior 

 lateral-line and trigeminal nerves; II, optic nerve; V, mandibular and maxillary trunk of 

 the trigeminal nerve; VII, facial nerve; IX, glossopharyngeal nerve; X, vagal nerve. 



