CHAPTER IV. 

 THE ORGANS OF SPECIAL SENSE. 



The Nose. The nose, the organ of the sense of smell, 

 is composed of a framework of bones and cartilages, the 

 bridge being formed by the two nasal bones, and the 

 septum by the vomer and the triangular cartilage. It 

 consists of two parts, the external nose and the internal 

 or nasal fossce, which open to the face by the anterior 

 nares or nostrils and into the pharynx by the posterior 

 nares. Externally it is covered with skin, internally 

 with ciliated mucous membrane. The jossce have the 



FIG. 18. The nasal cavity. (After Sobotta.) 



inferior turbinated bones along their outer walls and are 

 divided into three parts known as the superior, the 

 middle, and the inferior meatus, the middle one connect- 

 ing with the antrum of Highmore, while into the inferior 

 meatus the lachrymal canal empties. There are many 

 small muscles of which little use is made, although in 



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