Ultrastructure and histochemistry of the subepithelial glands of the nasal septal island in dromedaries with special reference to the possible functions

Abstract

Highlights The NSI subepithelial glands in dromedaries had unique anatomical features. Their ultrastructural features are typical for APUD cells. They may have the structures required for synthesis of active peptides, amines and chemical mediators.

The Complex Histopathological and Immunohistochemical Spectrum of Neuroendocrine Tumors—An Overview of the Latest Classifications

“…These cells produce peptide hormones stored in neurosecretory granules and released into the bloodstream [ 1 , 2 ]. Neuroendocrine cells share some common ultrastructural (membrane bound secretory vesicles of varying electron density, abundant rough endoplasmic reticulum and free ribosomes and electron-dense mitochondria) [ 2 , 3 ] and cytochemical characteristics (silver reactivity). Following his discovery of thyroid parafollicular cells, these characteristics prompted A.G.E.…”