The innermost part of the adrenal gland derived from neural crest cells of the ectoderm that releases the catecholamine hormones epinephrine (adrenalin) and norardrenalin (norepinephrine) into the blood stream in response to stress and fear. See figure below for location of adrenal cortex and medulla in an adrenal gland situated on the top of the kidney.
Adrenal cortex,adrenal gland, and adrenal medulla
See Adrenal cortex, Adrenal glands, Catecholamines, Ectoderm, Epinephrine (or adrenaline), Estrogen, Germinal (or germ) layers, Neural crest, Neural tube, Norepinephrine (or noradrenaline), Stress (or adrenal) hormones, Sympathetic nervous system (SNS)