* moderate chronic inflammatory infiltrate: APS 5%, APINC 35%
The differences in the type and prevalence of glands found in the lamina propria of the APS and APINC ([c.sup.2] = 5.77; p[less than]0.05):
* equal number of serous and mucous glands: APS 0%, APINC 5%
* preponderance of serous glands: APS 70%, APINC 35%
* preponderance of mucous glands: APS 10%, APINC 50%
We endeavored to identify the primary differences and similarities with regard to the constitution of the APS and APINC. We classified our findings according to each of the three analyzed areas of the nasal mucosa: the epithelium, the basement membrane, and the lamina propria.
Stratified squamous epithelium (keratinized and nonkeratinized combined) was significantly more prevalent in the APS (55%) than in the APINC (5%); stratified squamous keratinized epithelium was present only in the APS.
The presence of epithelia other than respiratory epithelium in the APS and APINC has also been observed by other authors.
Conversely, we found a high degree of thickness in 65% of the APINC samples, which was similar to the high amount of respiratory epithelium found in that region (50%).
[6,11] There was a high degree of thickness in the APINC, which not only has a greater amount of respiratory epithelium, but is also less adaptable to external agents.
We studied the lamina propria to compare the types of inflammatory infiltrate and the types of glands in the APS and APINC.
A large quantity (35%) of moderate chronic inflammatory infiltrate was present in the APINC, which, as mentioned, also had a greater amount of respiratory epithelium than did the APS and which was less adaptable to environmental stimuli.