150 



COMPARATIVE ANATOMY 



- Wo 



FIG. 121. THE ENTIRE NERVOUS SYSTEM or THE FROG. (After A. Ecker.) 

 From the ventral side. 



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

 M, spinal cord ; Ml to M10, spinal nerves, which are connected at SM by 

 branches (rami communicantes) with the ganglia (Si to S10) of the sympathetic 

 (8) -, No, femoral nerve ; Ni, sciatic nerve ; / to X, first to tenth cranial 

 nerves ; G, ganglia of the vagus ; Vg, Gasserian ganglion ; o, eye ; N, nasal 

 sac ; Va to Ve, the different branches of the trigeminal ; F, facial nerve ; 

 Vs, connection of the sympathetic with the Gasserian ganglion ; XI to X4, 

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

 should be shown accompanying the vagus peripherally. 



