382 



l^II.pal. \ 



<:Ct.H. 



Fig. 298. — The central nervous system and principal nerves of a frog, seen from 



below. — Partly after Ecker. 



r.-X. Cranial nerves ; i-io, spinal nerves ; V.md., V.mx., V.op., mandibular, maxillary, and ophthalmic 

 branches of fifth cranial nerve ; V.x., a small twig from the undivided main branch of the same 

 nerve ; VI', sixth cranial nerve after leaving the prootic ganglion ; Vll.h., and VII. md., hyoidean 

 and mandibular branches of hyomandibular nerve ; Vll.htn., VI I. pal., hyomandibular and 

 palatine branches of seventh cranial nerve; IX'., branch from ninth cranial nerve to seventh; 

 IX"., main branch of ninth cranial nerve; X.v., tenth cranial nerve passing to viscera; X.x., a 

 branch from the vagus to certain muscles ; an.V., annulus of Vieussens, through which the sub- 

 clavian artery passes ; br., brachial nerve ; f.t., filum terminale ; G.g., Gasserian-geniculate or 

 pro-otic ganglion; hyn., hypoglossal (first spinal) nerve; inf., infundibulum ; pit., pituitary body; 

 r.c, ramus communicans ; sci.n., sciatic nerve ; sy.c, longitudinal commissure of sympathetic chain ; 

 sy.g., sympathetic ganghon ; v.g., vagus ganglion. 



