

THE MEMBRANOUS LABYRINTH 



595 



III. The organ of smell the olfactory nerves and the raucous 

 membrane of the nasal passages p. 448, and Figs. 290-2. 



JV. The organ of hearing so far as the acoustic nerve, and the 

 distribution of its cochlear branch are concerned has been de- 

 scribed on p. 453, Figs. 300 and 301. 



Fig. 422. 





The soft parts of the vestibule taken ont of their bony case, so as to show the distribution of the 

 nerves in the ampullae. 1. The superior semicircular membranous canal or tube. 2. The external 

 semicircular tube. 3. The inferior semicircular tube. 4. The tube of union of the superior and in- 

 ferior canals. 5. The sacculus ellipticus. 6. The sacculus sphericus. 7. The portio dura nerve. 8. 

 The anterior fasciculus of the auditory nerve. 9. The nerve of the sacculus sphericus. 10, 10. The 

 nervous fasciculi to the superior and external ampullae. 11. The nerve to the sacculus ellipticns. 

 12. The posterior fasciculus of the auditory nerve furnishing (13), the filaments of the saccnlus 

 sphericus, and 11, the filaments of the cochlea, cut off. 



Fig. 423. 



The ampulla of the external semicircular membranous canal, showing the mode of termination of 



its nerve. 



