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Chromaffin cells

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Chromaffin cells, also known as pheochromocytes, are neuroendocrine cells found in the medulla of the suprarenal (adrenal) gland.

Chromaffin cells are responsible for producing and storing the catecholamines epinephrine and norepinephrine in granules, which are involved in the "fight-or-flight" response of the body. 

Chromaffin cells form synapses with preganglionic sympathetic nerve fibers.

As a response to the synapse, they release the neurohormones from their granules into the venous sinusoids and ultimately into the systemic circulation via the central medullary vein of the suprarenal gland to reach their site of action.

Terminology English: Chromaffin cells
Synonym: Pheochromocytes
Definition Chromaffin cells are neuroendocrine cells found in the medulla of the suprarenal (adrenal) gland and produce catecholamines.

Learn more about the histological structure of the suprarenal glands in the following study unit:

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