NoRRis, Nerves of Amphiuma. 



559 



trm. muscles of the trunk. 



vp. vomero-palatine bone. 



/. n. olfactorius. 



Jjo. branch of n. olfactorius innervating Jacobson's organ. 



Irrt. roots of n. olfactorius. 



//. n. opticus. 



///. n. oculomotorius. 



IV. n. trochlearis. 



V{2). motor root of the V ner\'e. 



VI. n. abducens. 



Vila, the ventral roots of the facial nerve, communis and motor components. 



Vllaa. the communis portion of the preceding. 



Vllab. the motor root of the facial nerve. 



Vlla+VIIbb. the ventral or main trunk of the facial nerve. 



Vllb. the lateral line portion of the facial nerve. 



VIIb(i + 2+^) the three rootlets of the preceding. 



Vllba. the "dorsal VII." 



Vllbb. that portion of the lateral line component of the facial nerve that passes ventrally 

 and joins Vila. 



VIIba+ V. the trunk formed by the union of general cutaneous fibers from the gasserian gan- 

 glion with the "dorsal VII.'' 



VIII. n. acusticus. 



Vlllap. branch of VIII nerve to the posterior ampulla. 



Vllllag. branch of VIII nerve to the lagena. 



Vlllmn. branch of the VIII nerve to the macula neglecta. 



Vlllpb. branch of the VIII nerve to the pars basilaris. 



VIIIs. branches of the VIII nerve to the sacculus. 



VIIIv. vestibular branch of the VIII nerve. 



VIII(i). fibers of the VIII nerve that pass into the tractus spinalis VIII. 



VIII(2). fibers of the VIII nerve that pass anteriorly into the acusticum. 



VIII(s). fibers of the VIII nerve that enter "tract b." 



VIII(4). coarse fibers that enter the sp. VIII tract distinct from VIII (i). 



IX(l). communis root of the IX nerve. 



IX(2). motor root of the IX nerve. 



X.I. second branchial nerve. 



X.2. third branchial nerve. 



X.3+4. branch of r. int.-acc. representing the fourth and fifth branchial nerves. 



X{l). first or lateral line root of the X nerve. 



X{2) second root (group of rootlets) of the X nerve. 



^(5),.Y(4),.Y(5). third, fourth and fifth roots of the X nerve. 



X.adVII. r. communicans between the X and VII nerves. 



X.adVII.d. dorsal division of r. communicans. 



X.adVII.v. ventral division of r. communicans. 



