PLATE IX 



Plan of the Endolymphatic and the Perilymphatic Spaces. 



(Testut. ) 



1, utricle; 2, saccule; 3, semicircular canal; 4, canalis cochlearis; 5, ductus endolymph- 

 aticus; 6, saccus endolymphaticus ; 7, canalis reuniens (Hensen's); 8, scala tympani; 9, 

 scala vestibuli; 10, helicotrema ; 11, aqueductus vestibuli; 12, aqueductus cochlearis; 

 13, periosteum; 14, dura mater; 15, stapes with its base in the foramen ovalis; 16, 

 membrane in the fenestra rotundum. 



