DEVELOPMENT OF THE MEMBRANA TECTORIA 



437 



membrana. Except in so far as they are enclosed therein the 

 hairs have nothing to do with the development of the tectorial 

 membrane. 



Fig. 5 Portion of basal epithelium indicated by * in figure 4, showing the struc- 

 tural relation of the membrana tectoria to the columnar cells; m.tect., membrana 

 tectoria; X, threadlike lamellae originating between two epithelial cells; col.ep., 

 columnar cells of inner group; m.bas., basilar membrane. Oc. 2, 2 mm. Obj., 

 t. 1. 160. 



Fig. 6 Drawing showing the membrana tectoria developing over the hair cells 

 of the spiral organ (marked h.c. in fig. 4); i.h.c, inner hair cell; o.h.c, outer hair 

 cell; t.sp., spiral tunnel. Ob. 4, 2mm. Obj. 



