CONTENTS 



Introduction 5 



Material g 



Technique 6 



I. On the growth of the cochlea 12 



A. On the growth of the radial distance between the two spiral 

 ligaments 13 



B. On the growth of the tympanic wall of the ductus cochlearis. . . 16 



1. Membrana tectoria 28 



2. Membrana basilaris 39 



3. The radial distance between the habenula perforata and 

 the inner corner of the inner pillar cell at base 47 



4. The radial distance between the habenula perforata and 

 the outer corner of the inner pillar cell (resp., the inner 

 corner of the outer pillar cell) at base 48 



5. The radial basal breadth of the outer pillar cell (including 

 the outer pillar) 57 



6. The radial distance between the habenula perforata and 



the outer border of the foot of the outer pillar cell 63 



7. The greatest height of the greater epithelial ridge (dem 

 grossen Epithelwulst Bottcher's s. Organon Kollikeri) resp. 



of the inner supporting cells 63 



8. The radial distance between the labium vestibulare and 

 the habenula perforata 68 



9. The radial distance between the labium vestibulare and 



the inner edge of the head of the inner pillar cell 71 



10. Vertical distance from the membrana basilaris to the 

 summit of the pillar cells 75 



11. The greatest height of the tunnel of Corti 77 



12. The height of the papilla spiralis at the third series of the 

 outer hair cells 77 



13. The greatest height of Hensen's supporting cells 83 



14. The angle subtended b} the extension of the surface of 

 the lamina reticularis with the extended plane of the 

 membrana basilaris 84 



15. Lengths of the inner and outer pillar cells 85 



16. Inner and outer hair cells 94 



17. Deiter's cells 109 



18. Summary and discussion 116 



C. On the growth of the largest nerve cells in the ganglion spirale . 124 



observations 124 



Discussion 136 



Conclusions 143 



3 



