i8o 



COMPARATIVE MORPHOLOGY OF VERTEBRATES 



Fig. 189. — Diagrams of the branches and components of (A) the trigeminal, (5) 

 facial, and (C) glossopharyngeal and vagus nerves of a lower vertebrate, b, buccalis 

 nerve; ct, chorda tympani; d, dorsal rami of IX andX; g, gastric nerve; gg, in A, Gas- 

 serian ganglion, in B, geniculate ganglion h, hyoid nerve; hm, hyomandibular trunk; 

 j, Jacobson's commissure; ig, jugular ganglion; I, lateralis, nerve of X; Ig, lateralis 

 ganglion; tnd, mandibular nerve; mx, maxillaris nerve; mxe, maxiUaris externus. nerve; 

 op, ophthalmicus profundus nerve; os, superficial ophthalmic nerve; pal, palatine nerve; 

 po, pr, post- and pretrematic rami; sp, spiracle; st, nerve to supratemporal lateral 

 line organs; 1-5, gill clefts. 



