What part of adrenal gland is controlled by the autonomic nervous system?

The adrenal medulla, the inner part of the adrenal gland, is primarily controlled by the autonomic nervous system, specifically the sympathetic division. When stimulated by the sympathetic nervous system, the adrenal medulla releases catecholamines, such as adrenaline (epinephrine) and noradrenaline (norepinephrine), into the bloodstream. This response is part of the "fight or flight" reaction, preparing the body for stressful situations.