| argentaffin | Pertaining to cells or tissue elements that reduce silver ions in solution, thereby becoming stained brown or black. Origin: L. Argentum, silver, + affinitas, affinity (05 Mar 2000) |
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| argentaffin cell | So called because they will form cytoplasmic deposits of metallic silver from silver salts. Their characteristic histochemical behaviour arises from 5 HT, which they secrete. Found chiefly in the epithelium of the gastrointestinal tract (though possibly of neural crest origin) their function is rather obscure, although there is a widely distributed family of such paracrine (local endocrine) cells (APUD cells). (18 Nov 1997) |
| argentaffin cells | Cell's that contain granules which precipitate silver from an ammoniacal silver nitrate solution. See: enteroendocrine cells. (05 Mar 2000) |
| argentaffin granules | Granule's that reduce silver ions from an ammoniacal silver nitrate staining solution. (05 Mar 2000) |
| argentaffinoma | <oncology, tumour> A tumour which secretes excessive amounts of the hormone serotonin. The clinical result is carcinoid syndrome. These tumours may grow anywhere in the gastrointestinal tract (and in the lungs) with approximately 90% in the appendix. The remainder occur in the ileum, stomach, colon or rectum. (27 Sep 1997) |
| Masson's argentaffin stain | <technique> A stain used to stain enterochromaffin granules brown-black. (05 Mar 2000) |
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| argentaffin |
having an affinity for silver and chromium salts; said of tissues. See also under cell.
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| argentaffin c.’s |
enterochromaffin cells whose granules stain readily with chromium and silver salts, located in the basilar portions of the glands of the gastrointestinal tract. Based upon their staining reactions with silver, these cells have been divided into two groups: those that reduce silver without pretreatment (argentaffin c's), and those that require prior exposure to a reducing substance (argyrophilic c's). See also argentaffinoma.
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| argentaffin f.’s |
reticular f's.
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| argentaffin g.’s |
granules that stain with silver.
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| argentaffinoma |
a carcinoid tumor of the gastroenteric tract formed from the argentaffin cells (Kulchitzky's cells) found in the enteric canal; such tumors elaborate a variety of catecholamines that produce the symptom complex called carcinoid syndrome.
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