X CONTENTS. 



CHAPTER XXXIV. 



THE ORGAN OF HEARING. 



I. 



THE EXTERNAL AND MIDDLE EAR, EXCLUDING THE EUSTACHIAN TUBE. 



BY J. KESSEL. 



PAGE 



A. THE EXTERNAL EAR 27 



Auricle 27 



External Auditory Meatus ..... 29 



Ceruminous Glands ....... 29 



Vessels and Nerves ....... 30 



Membrana Tympani ...... 30 



Internal Layer 31, 38 



External Layer 33 



Membrana Propria 34 



Vessels ........ 42 



Lymphatics ........ 44 



Nerves . . . . . . . . .46 



B. THE MIDDLE EAR ........ 51 



The Tympanic Cavity . . . . . .51 



Mucous Membrane . . . . . . .51 



Peculiar Corpuscles . . . . . .53 



Vessels and Lymphatics ...... 56 



Nerves ......... 57 



Ossicula ......... 61 



Mastoid Cells .62 



Bibliography ......... 63 



II. 



THE EUSTACHIAN TUBE. 

 BY PROFESSOR DR. RUDINGER, 



OF MUNICH. 



Osseous and Cartilaginous Portion of the Eustachian Tube . 67 

 The Muscular or Membranous Segment ..... 70 



