STRUCTURE OF THE COCHLEA. 



287 



FIG. 322. SEMI-DIAGRAM- 

 MATIC VIEW OF PART OF 

 THE BASILAR MEMBRANE 

 AND TUNNEL OF CORTI OF 

 THE RABBIT, FROM ABOVE 

 AND THE SIDE. (Much 



magnified. ) 



/, limbus ; Cr., extremity or 

 crest of limbus with tooth-like 

 projections; b.b., basilar mem- 

 brane; sp. I. , spiral lamina with, 

 p, perforations for transmission 

 of nerve-fibres ; i.r., fifteen of 

 the inner rods of Corti; h.i., 

 their flattened heads seen from 

 above ; e.r. , nine outer rods of 

 Corti; h.e., their heads, with 

 the phalangeal processes ex- 

 tending outward from them 

 and forming, with the two 

 rows of phalanges, the lamina 

 reticularis, I.r. At the lower 

 part of the figure the connect- 

 ive-tissue fibres and nuclei of 

 the undermost layer of the 

 basilar membrane are seen 

 through the upper layers. 

 Portions of the basilar pro- 

 cesses of the outer hair-cells 

 remain attached here and 

 there to the membrane at this 

 part. 



r 



FIG. 323. AN OUTER HAIR-CELL IN CONNECTION WITH ITS BASILAR 

 PROCESS. From the guinea-pig. (Highly magnified.) 



Two auditory hairs have remained attached to the cell ; b. bulged lower 

 end of cell ; p, basilar process, protoplasmic above, but becoming cuti- 

 cular below, and slightly expanded at the extremity, /, which is broken 

 away from the basilar membrane. 



