RECAPITULATION OF THE NERVES. 269 



the spinal V tract. This tract is drawn in Fig. 9 above 

 the commnnis root, but in Fig. 4 below that root. As a 

 matter of fact, it lies below the cephalic portion of the 

 root, but above the caudal portion. These fibres supply 

 the skin of the occipital region and of the dorsal part of 

 the operculum. 



The lateral line root is the most dorsal and cephalic 

 member of the vagus complex. It terminates in the 

 tuberculum acusticum and supplies all of the lateral line 

 organs which are not supplied from the VII nerve. 



J . — TJie Glossopharyngeus. 



There are but two components present, as shown in 

 Fig. 10. The motor root arises from the cephalic end of 

 the nucleus ambiguus and is the exact counterpart of the 

 motor root of the vagus. It runs out under the spinal V 

 tract and distributes to the muscles of the first gill. 



The communis root passes in under the root of the r. 

 lateralis vagi and over the spinal V tract to terminate in 

 the fasciculus communis near its entrance into the lobus 

 vagi. These fibres distribute to the hinder surface of the 

 first gill cleft, /. r. , to the first functional gill, exclusively — 

 taste buds and general mucous surfaces — and are ex- 

 tended forward ventrally as a lingual nerve to the tip of 

 the hyo-branchial apparatus. From the sensory root a 

 small anastomosing branch runs up to join the root of the 

 r. lateralis vagi. 



^. — The Auditory Nerve. 



This nerve terminates in the tuberculum acusticum and 

 cerebellum along with the lateralis roots of the X and VII 

 nerves. The details of its central connections were not 

 investigated. So far as known it contains only acustico- 

 lateralis fibres. 



