ELASMOBRANCH BRAIN ORGANIZATION 



151 



mlf 



2 mm 



Figure 22 Transverse sections through middle levels of the hindbrain of Raja eglanteria. 

 cc, cerebellar crest; de, descending tract and nucleus of VIII; dn, dorsal nucleus of the 

 anterior lateral-line lobe; dt, descending trigeminal tract; dv, descending trigeminal nu- 

 cleus; gt, secondary gustatory tract; ir, inferior raphe nucleus; irf, inferior reticular forma- 

 tion; lg, lateral granular layer; lrz, lateral reticular zone; mlf, medial longitudinal 

 fasciculus; mn, magnocellular nucleus of VIII; mrf, medial reticular formation; ni, nucleus 

 intermedius of the posterior lateral-line lobe; vl, vagal lobe; VII, facial motor nucleus; 

 VIII, roots of statoacoustic nerve; IX, glossopharyngeal motor nucleus; X, nucleus X 

 (possible cells of origin of efferent fibers to VIII and lateralis nerves). 



