Appendix                                         Chart

                   
Cell types: Absorptive, Paneth, goblet, argentaffin-endocrine cells, lymphocyte
 

Differential diagnosis:
 Small luminal organ with distinct outer coat include oviduct which has numerous mucosal folds and no rings of lymphatic follicles as in the appendix. Such lamina as in the blood vessels have squamous epithelial covering (i.e. endothelium).

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Diagnostic Features:
a. Tissue is hollow and presents with numerous small lumen which fills less than 1/10th of low power field.
b. The epithelium is of simple columnar variety and rings of lymphatic follicles which are light staining, are characteristic of this mucosa.
c. There are no villi since the appendix is an outpocketing of the colon which also does not have them.
d. There is a distinct outer coat of serosa and the lumen is very small.

Draw your own section here and make your diagnosis by data base selection below

 

 

 

 

 

 

 

 

 

 

 

 

 

Database selection: Practical Tissue Gross

Level 1: Select hollow
Level 2: Select small as opposed to large since lumen fills less tan 1/10th low power field of tissue of rat to man. This will select from database both cartilage and non cartilage containing tubes.
Level 3: Select distinct outer coat and then no cartilage and columnar epithelium which then includes appendix. Then select no mucosal fold which eliminates oviduct.

Can you identify the cell types and the ring lymphatic follicles?

 

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