HISTOLOGIC LOOK ALIKES-

Gallbladder vs Small Intestine

Similarity- Both have prominent mucosal folds and smooth-muscle muscularis externas.

Gallbladder-
1. No true villi- mucosal folds resemble villi
2. No goblet cells (except in neck region)
3. Diverticula (sinuses) present
4. No muscularis mucosae
5. Smooth-muscle layers thin and interlacing
 
Small Intestine-
1. Many villi
2. Abundant goblet cells
3. No diverticula
4. Muscularis mucosae present
5. Two distinct smooth-muscle layers
 
Pancreas vs Partoid
 
Similarity- Both have serous acini with pyramidal cells.
 
Pancreas-
1. All serous acini with pyramidal cells
2. Minute acinar lumina associated with centroacinar cells
3. Few fat cells
4. Islet tissue prominent
 
Partoid-
 
1. All serous acini with pyramidal cells
2. Small acinar lumina - no centroacinar cells
3. Many fat cells