Enteroendocrine cells
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Enteroendocrine cells are specialized endocrine cells of the gastrointestinal tract. They produce hormones such as serotonin<ref>UIUC Histology Subject 321</ref>, somatostatin and enteroglucagon.
Most enteroendocrine cells are found in the islets of Langerhans, but they are also found in other locations. For example, the G cells (which secrete gastrin) are located primarily in the stomach.<ref>Medcyclopaedia at GE iv_1/g/G_cell</ref>. Enteroendocrine cells are also found in the duodenum.<ref>Histology at BU 11604loa - "Endocrine System: duodenum, enteroendocrine cells"</ref>
Enterochromaffin-like cell and enterochromaffin cells are also considered enteroendocrine cells.<ref>MeSH Enteroendocrine+cells</ref>
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| Upper gastrointestinal tract
Mouth | Pharynx (nasopharynx, oropharynx, hypopharynx) | Esophagus | Crop | Stomach (rugae, gastric pits, cardia, pylorus) Lower gastrointestinal tract Small intestine (duodenum, jejunum, ileum) | Vermiform appendix Large intestine: Cecum | Colon (ascending colon, transverse colon, descending colon, sigmoid colon) | Rectum (Houston valve, rectal ampulla, pectinate line) | Anal canal (anal valves, anal sinuses, anal columns) Anus: Sphincter ani internus muscle | Sphincter ani externus muscle Enteric nervous system: Meissner's plexus | Auerbach's plexus Enteroendocrine cells: G cells | Enterochromaffin cells | Enterochromaffin-like cell GALT: Peyer's patches | M cells parietal cells | chief cells | goblet cells | Brunner's glands | Paneth cells | enterocytes intestinal villus/microvillus | crypts of Lieberkühn | circular folds | taenia coli | haustra | epiploic appendix |
