2 5 8 



PRACTICAL ZOOLOGY 



Fig. 147. — Nervous system and sense organs in the head of the 



1, cerebrum; 2, mid-brain; 3, optic lobes; 4, cerebellum; 5. medulla. 



e, eye; fv, first vertebra; gpn, glosso-pharyngeal nerve; hn, first spinal 

 nerve; ie, internal ear; no, nasal opening; on, olfactory nerve; os, olfactory 

 sacs; p, pneumogastric nerve ; sc, spinal cord ; sv, second vertebra ; t, tympa- 

 num ; tn, trigeminal nerve. (After Jammes.) 



