THE SPECIAL SENSES 



319 



Outer 



Middle 



Pinna 



Canal 



Bones 



Openings 



Internal 



Cartilaginous framework. 



Fatty tissue. * 



Muscles. 



Skin. 



Collects sound waves and reflects 

 ^ them into the auditory canal. 

 f 1J inch long. 



J Closed internally by the drum. 

 1 Glands secrete "wax." 

 [ Hairs directed outwards., 

 An irregular cavity in 'the temporal bone. 

 ( Malleus. 

 I Incus. 

 [ Stapes. 

 f Fenestra ova lis closed by the 



stapes. 



1 Fenestra rotunda closed by a 

 I membrane. 



Vestibule - ( Central Portion. 

 ' Fenestra ovalis. 

 f Three in number. 

 \ Open into the vesti- 

 [ bule. 



(A spiral tube. 

 2j turns round the 

 modiohu. 

 Fenestra rotunda. 

 Within the osseous. 

 Similar in shape. 

 Surrounded by perilymph. 

 Contains endolymph. 

 Otoliths and hair-like processes. 

 Terminal fibres of auditory nerve. 



Canals 



Cochlea 



QUESTIONS FOR TOPICAL REVIEW 



FASR 



1. What is said of the production of sensation? 264, 265 



2. What is said of the variety of sensation? 265 



3. What is said of the general sensibility? 266 



4. What is said of the sensation of pain ? 267 



5. What is said of the uses of pain? 267-269 



6. Say what you can of the special sensation 269-271 



7. Say what you can of the organs of touch 271, 272 



8. Say what you can of the sense of touch 272-273 



9. Say what you can of the delicacy of touch 274, 275 



10. What is understood of the sensations of temperature and weight ?. 275, 276 



11. What is understood by the organ of taste ? . 276, 277 



12. What is understood by the sense of taste ? 277, 278 



13. What is understood by the relations of taste 279, 280 



14. Explain the influence of education, etc 280 



15. Explain the sense of smell 280, 281 



