THE SKATE. 75 



186. Two large bundles of nerves proceeding one from 

 either side of the medulla oblongata, beneath the restiform 



■vn. "wi; 



Fig. 26.— Raja nasuta. External view of the roots of the 5th, 7th, 

 and 8th cerebral nerves of the left side (nat. size). 



V\ V^', ventral or anterior roots of the trigeminal: V^, dorsal or 

 posterior root of the same : Til, VII', roots of the portio dura : VIII, 

 root of the auditory nerve. 



bodies. Each bundle is seen to consist of an anterior 

 smaller and a posterior larger fasciculus. The former (Figs. 

 23, 26, and 27 V") goes to form the inferior ramus of the 



Fig. 27. — Raja nasuta. The principal branches of the 5th, 7th, and 

 8th cerebral nerves (nat. size). 



V- ventral and V^, dorsal root of the fifth: F'% dorsal, and V^^, 

 ventral ramus of the orbito-nasal nerve: F=% palato-nasal nerve : V^'°, 

 maxillary nerve : F3, mandibular nerve : pt.qu, nerve to upper jaw ; 

 na, nerves to the region of the nostrils : VII, portio dura : VIII, 

 auditory nerve. 



first division of the fifth nerve, and the main part of its 

 third division, besides contributing fibres to the second 



