SENSE OF HEARING. 



601 



.& 





.{t F ^m 



FIG. 378. Tympanum of left ear, with ossicles in situ : 1, suspensory ligament 

 of malleus ; 2, head of malleus ; 3, epitympanic region ; 4, external ligament of 

 malleus ; 5, processus longus of incus ; 6, base of stapes ; 7, processus brevis of mal- 

 leus; 8, head of stapes; 9, os orbicular e ; 10, manubrium ; 11, Eustachian tube; 12, 

 external auditory meatus ; 13, membrana tympani ; 14, lower part of tympanum 

 (Morris). 



FIG. 379. Otoscopic view of left membrana tympani : 1, membrana fiaccida : 2, 2', 

 folds bounding the former ; 3, reflection from processus brevis of malleus ; 4, pro- 

 cessus longus of incus (occasionally seen) ; 5, membrana tympani ; 6, umbo and end 

 of manubrium; 7, pyramid of light (Morris). 



