Histamine<unk> s synthesize and secrete histamine. These cells are stimulated by the hormones gastrin (not depicted in the adjacent diagram) and pituitary adenylyl cyclase-activating peptide. G cells are stimulated by vagal stimulation through the neurotransmitter gastrin-releasing peptide; this causes the G cells to secrete gastrin, which in turn stimulates<unk> s to release histamine. Note that this circuit is not activated by acetylcholine, which is of particular importance because the administration of atropine will not block the vagal stimulation of the G cells, as ACh is not the neurotransmitter for these cells. However,<unk> s are activated directly by ACh on M1 receptors from direct vagal innervation leading to histamine release. This pathway will be inhibited by atropine. Gastrin is transferred from a specific type of G cell in the gastric epithelium to the<unk> s by blood. Histamine and gastrin act synergistically as the most important stimulators of hydrochloric acid secretion from parietal cells and stimulators of secretion of pepsinogen from chief cells. The most important inhibitor of the<unk>  is somatostatin from oxyntic D cells.<unk> s also produce pancreastatin and probably other peptide hormones and growth factors.
Enterochromaffin-like cell
Signet ring cell
Langhans giant cell
Nevus cell
Intraepithelial lymphocyte
Stratified squamous epithelium
Decoy cells
Touton giant cell