The adrenal medulla secretes approximately 20% noradrenaline (norepinephrine) and 80% adrenaline (epinephrine). These water-soluble hormones are the major hormones underlying the fight-or-flight response. The adrenal medulla is responsible for the production of catecholamines, derived from the amino acid tyrosine.Īdrenal gland: The adrenal medulla sits below the three layers of the adrenal cortex and is innervated by nerve fibers. The adrenal medulla is the core of the adrenal glands, and is surrounded by the adrenal cortex. chromaffin: The cells of the adrenal medulla that secrete adrenaline and noradrenaline in response to nervous stimulation.adrenal cortex: The outer portion of the adrenal glands that produces hormones essential to homeostasis.The adrenal cortex is devoted to the synthesis of corticosteroid and androgen hormones.
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