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It is the innermost part of the adrenal gland, consisting of cells that secrete epinephrine (adrenaline), norepinephrine (noradrenaline), and a small amount of dopamine in response to stimulation by sympathetic preganglionic neurons.he adrenal medulla consists of irregularly shaped cells grouped around blood vessels. These cells are intimately connected with the sympathetic division of the autonomic nervous system (ANS).
The adrenal medulla mainly secretes epinephrine (more commonly  known as adrenaline), norepinephrine, and small amount of dopamine.  Epinephrine and norepinephrine are relea â¦ sed from the adrenal  medulla in response to short term stress. These two hormones are  catecholamines.Composed mainly of hormone-producing chromaffin  cells, the adrenal medulla is the principal site of the conversion  of the amino acid tyrosine into the catecholamines adrenaline  (epinephrine), noradrenaline (norepinephrine), and dopamine.hese two hormones are  catecholamines. Composed mainly of hormone-producing chromaffin  cells, the adrenal medulla is the principal site of the conversion  of the amino acid tyrosine into the catecholamines adrenaline  (epinephrine), noradrenaline (norepinephrine), and dopamine.