 there are three major epithelial types in the nasal mucosa , in addition to numerous accessory structures , some of which are species specific . without careful and consistent processing of the nose tissue , histopathologic assessment of lesions in the nasal cavity 
 may be compromised . 
 while formalin fixation may be used for routine review of the nasal cavity , bouin 's fixation provides better histologic detail and fewer artifacts . 
 decalcification is not recommended for nasal tissues to be examined by transmission electron microscopy because of the detrimental effect of decalcifying solutions on sensory cells . 
 three levels of the nasal cavity may be used for routine histologic review of the nasal cavity , but four or five levels may be more appropriate for certain studies.imagesfigure 2.figure 3.figure 4.figure 5.figure 6.figure 7.figure 8.plate 1 . 
 aplate 1 . 
 bplate 1 . 
 cplate 1 . 
 dplate 2.plate 2.plate 3.plate 4.plate 5.plate 6.plate 7 . 
 aplate 7 . 
 bplate 8.plate 9.plate 10.plate 11.plate 12.plate 13.plate 14.plate 15.plate 16 . 
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