granular enterochromaffin cell

The term "enterochromaffin cell" refers to epithelial cells found in the lining of the digestive tract, particularly concentrated in the small intestine and appendix. These cells contain granules that are believed to have a secretory function.1

Key characteristics and functions include:
* Location: Found randomly within the intestinal mucous membrane and in structures called Lieberkühn glands.1
* Granule Content: Their granules contain serotonin.1
* Function: Serotonin is thought to diffuse out of these cells and stimulate smooth muscle contractions in the digestive tract walls, a process known as peristalsis, which aids in food passage.1

Enterochromaffin cells are also found in the pancreas, where they are a minor cell type that synthesizes serotonin. These cells stain with chromium salts and typically contain serotonin. They are also known as argentaffin cells.231