150 



COMPARATIVE ANATOMY 



M2 



Fic!. 121. — The Entikk Nervous System of the Frog. 

 From the ventral side. 



(After A. Ecker.) 



He, cerebral hemispheres (prosencephalon) ; Lop, optic lobes (mesencephalon), 

 iV, spinal cord ; Ml to MIO, spinal nerves, whicli are connected at" SH by 

 branches (rami communicantes) with the ganglia (SI to SlO) of the sympathetic 

 (iS) ; No, femoral nerve ; Ni, sciatic nerve ; I to A', first to tenth cranial 

 nerve.s ; O, ganglia of the vagus ; Vfi, Gasserian ganglion ; o, eye ; iV^, nasal 

 sac ; Va to V(t, the different branches of the trigeminal ; F, facial nerve ; 

 Vs, connection of the sympathetic with the Gasserian ganglion ; XI to XJf, 

 the different branches of the vagus. Some of the fibres of the sympathetic 

 should be shown accompanying the vagus peripherally. 



