<P> Enterochromaffin cells are enteroendocrine and neuroendocrine cells with a close similarity to adrenomedullary chromaffin cells secreting serotonin and histamine . </P> <P> Located in the jejunum, N cells release neurotensin, and control smooth muscle contraction . </P> <P> S cells secrete secretin from the duodenum and jejunum, and stimulate exocrine pancreatic secretion . </P> <P> also called Delta cells, secrete somatostatin </P>

The enteroendocrine cells of the small intestine secrete