14 



ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



sections. These distances measure the radial breadth of the 



membranous cochlea and of the modiolus combined at these levels. 



In table 2 (chart 1) are entered the values for the radial 



distances found between the two spiral ligaments in fourteen 



TABLE 2 



Radial distance between the two spiral ligaments in radial-vertical section 



(chart 1 , figure 3) 



Ratios 1 — 12 days 1 

 1 — 20 " 

 1 — 546 " 



1.2 

 1.2 

 1.3 



TABLE 3— Condensed 

 Ratios of distances between the two spiral ligaments along 1-1 (turns I-II) and 



along 2-2 (turns III-IV), figure 3 



age groups, from one to 546 days. As we see, the average value 

 of the two distances grows rapidly from birth till six days of 

 age. After that period the value increases gradually till twenty 

 days, while after twenty days the increase is very slight indeed. 

 The ratios between 1 and 12, 1 and 20, and 1 and 546 days show 

 these relations. 



