782 



PROFESSOR JOHN G. M'KENDRICK 



b. Radial Breadth of Vestibular Wall. 













mm. 





inch. 



1000 times. 



Base, ..... 



•81 





0324 



32-4 



Middle, 



•88 





0325 



32-5 



Apex, 



•85 





•0340 



34-0 



Vestibular wall 



increases from 



base to 



apex. 





c. Radial Breadth of Tympanic Wall. 













mm. 





inch. 



1000 times. 



Base, ..... 



■45 





•018 



18 



Middle, 



•77 





•030 



30 



Apex, ..... 



•80 





•032 



32 



mm. 



inch. 



1000 til 



•585 



•023 



23 



•500 



•020 



20 



350 to -4 



•030 



30 



mm. 



inch. 



1000 times. 



•028 



•00112 



1-12 



•045 



•00180 



1-18 



•049 



•00196 



1-96 



mm. 



inch. 



1000 times. 



•21 



•0084 



8-4 



•34 



•0120 



12-0 



•36 



•0144 



14-0 



Tympanic ivall increases from base to apex. 



d. Height of Outer Wall. 



Base, 



Middle, . 

 Apex, 



Outer wall diminishes towards the centime and then increases. 



e. Height of the Tunnel. 



Base, 

 Middle, . 

 Apex, 



Tunnel becomes higher as we pass from base to apex. 



f . Radial Breadth of the Membrana Basilaris (from Habenula Perforata to the Spiral Ligament). 



Base, 

 Middle, . 

 Apex, 



The basilar membrane increases towards the apex. 



g. Radial Breadth of Limbus Spiralis. 



Base, 

 Middle, . 

 Apex, 



Base, 



Middle, 



Apex, 



h. Pillars. 



Base, 



Middle, 



Apex, 



Base, 



Middle, 



Apex, 



mm. 



•243 



inch. 



•0972 



1000 times. 



97-2 



•230 



•0920 



92-0 



•225 



•0900 



90-0 



\es towards the apex as the basilar membrane increases, 

 agnified 1000 times. In inches. 



Limbus. M ^- e Total. 



. 97-2 8-4 105-6 



. 92-0 



12-0 



104-0 



. 90-0 



14-0 



104-0 



Length of Inner Pillars. 

 mm. 



•048 



inch. 



•00172 



1000 times. 



1-72 



•068 



•00272 



2-72 



070 



•00280 



2-80 



Length of Outer Pillars. 

 •062 



•00248 



2-48 



•100 



•00400 



4-00 



103 



•00412 



4-12 



As we pass from base to apex both pillars lengthen. 



