GROWTH OF THE INNER EAR OF ALBINO RAT 



65 



on the inner supporting cells, which are termed 'Grenzzellen' 

 by Held ('02). The latter belong, of course, to this ridge, since 

 the inner hair cell marks the outmost row in the ridge. The 

 'Grenzzellen' of Held, however, are different from other high 

 cylindrical cells in the ridge, as they have a very intimate relation 

 with the ' Phalangenzellen ' of Held, stand with their bases just 



TABLE 36 — Condensed 



Ratios of the radial distance between the habenula perforata and the outer corner 



of the outer pillar cells at base — on age 



TABLE 37 



Radial distance between habenula perforata and the outer corner of the outer pillar 



cells at base — in m (Retzius) 



outward from the habenula perforata and serve to support the 

 inner hair cell as Deiters' cells support the outer hair cells. 



Thus the greater ridge includes in its prominence three kinds 

 of cells, the high cylindrical cells, the 'Grenzzellen' of Held and 

 the inner hair cell. 



The greatest height of this ridge is not situated at a fixed 

 point, but first lies somewhat outward from the middle part and 



