Editing Adrenal glands (section)

== '''Cellular structure''' ==

* '''Cortex''' 
** 2mm thick, with >80% of      the mass of the gland
** Zones
*** Zona glomerulosa
**** Thin layer of relatively        small cells with moderately eosinophilic, lipid-poor cytoplasm
**** Undulating inner border,        usually not forming a complete circumferential layer
*** Zona fasciculata
**** Largest layer
**** Long radial columns of        large, clear, lipid-laden cells
*** Zona reticularis
**** Small nests of compact,        eosinophilic cells
* '''Medulla'''
** Clusters and short cords of      chromaffin cells, which are large, polyhedral and packed with basophilic      secretory granules
** Catecholamines within those      granules yield a brown reaction when treated with chromium salts, giving      them their name
** Medulla is richly-endowed      with autonomic nerve fibres and ganglion cells. SNS fibres synapse      directly with the chromaffin cells.