24 SMELL, TASTE, ALLIED SENSES 



middle, the superior being absent. When a fourth concha 

 is to be seen, it is found above and behind the superior. 

 It has been designated the first supreme concha and it 



FIG. 1. Diagram of the lateral wall of the right nasal cavity of man. 1, Inferior concha; 

 2, middle concha; 3, superior concha; 4, first supreme concha; 5, second supreme concha; the 

 apertures numbered 6 to 10 are covered from sight by the conchas, but their positions are 

 indicated by vertical lining; 6, aperture of the nasolacrimal duct opening into the inferior 

 meatus; 7, opening of the maxillary sinus (middle meatus); 8, opening of the frontal sinus 

 (middle meatus); 9, and 10, openings of the ethmoid cells, 9, into the middle meatus, 10, 

 into the superior meatus; 11, opening of the Eustachian tube; 12, vesibule; 13, atrium; 14, 

 choana; 15, frontal sinus; 16, sphenoidal sinus whose opening is indicated by an arrow; 17, 

 olfactory region whose limits are marked by the dotted line. The vertical dotted line shows 

 the plane of section from which Fig. 2 was drawn. 



may be followed by a second or even a third supreme 

 concha. According to Schaeffer(1920), the first supreme 

 concha is to be observed in about 60 per cent of all adult 

 human beings. 



The three conchae ordinarily present project from 



