They modulate the secretory activity of the suprarenal cortex and innervate is blood vessels.īy LM: These are called chromaffin cells due to the affinity of catecholamines granules (epinephrine and nor-epinephrine) in their cytoplasm to react with chromium salts and stain deep brown (chromaffin reaction). Sympathetic ganglion cells are scattered throughout the medullary tissue.Chromaffin cells: their function is the synthesis and secretion of catecholamines.As it develops from the ectodermal neural crest, it contains two populations of parenchymal cells: It forms the central part of the suprarenal gland. The parenchyma is divided into 2 histologically and functionally different regions the cortex and the medulla.A network of reticular fibers supports the secretory cells and the blood vessels of the cortex and medulla. The stroma: the gland is covered by a connective tissue capsule that sends thin septa inside the gland.Histological structure of Suprarenal gland it has the same origin as the sympathetic nervous system hence médulla is considered as a modified sympathetic ganglion, where the neurons have acquired an endocrine activity and secrete catecholamines. The medulla: the reddish-brown central layer, which lies deep to the cortex.The cortex constitutes nearly 80-90% of the gland. It originates from the mesoderm, the same origin as the endocrine cells of the gonads secreting steroid hormones.
The cortex: the yellow peripheral layer, which lies beneath the capsule.Supra-renal glands Structure of suprarenal gland
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