THE EAR. 



517 



like extension of the sacculus coiled two and one-half times, 

 and in the bony cochlea lies just above the basilar mem- 

 brane. It is in the cochlea triangular in form, the basilar 



s.e. 



Fig. 159. THE MEMBRANOUS INNER EAR. 



u, utriculus with contained macula acustica; s, sacculus with contained macula acus- 

 tica; *. s. c, superior, p. s. c, posterior, e. 8. c, external semicircular canal, the crista acus- 

 tica being indicated in each ampulla; c, r, canalis reunieus, connecting the membranous 

 cochlea with the sacculus ; c, c, the membranous cochlea ; s, e, the ductus endolymphaticus. 

 This duct serves to connect the utriculus and the sacculus, and ends blind below in the 

 sac-like enlargement called the saccus endolymphaticus. 



membrane being the floor of it, and the membrane of Reiss- 

 ner being one of the sides. It lies, therefore, between the 

 scala tympani and the scala vestibuli, and for that reason is 

 frequently called the scala media. The scala media is filled 



Fig. 160. SECTION OF THE LEFT COCHLEA OF A CHILD, six TIMES NATURAL SIZE, SHOW- 

 ING THE MODIOLUS, THE SCALA TYMPANI, SCALA VESTIBULI, AND SCALA MEDIA. 



(After Reichert.) 



with endolymph, which is in direct continuity with the endo- 

 lymph in the sacculus, but is entirely shut off from the peri- 

 lymph around it. In this membranous cochlea we find the 



