The adrenal cortex is the source of a number of steroid hormones and is arranged as 3 major layers or zones, organized as concentric shells: Epinephrine (adrenaline) and norepinephrine (noradrenaline) are produced by the medulla. The adrenal gland consists of a medulla (the center of the gland) surrounded by the cortex. AnatomyĪdrenal glands are small triangular organs located on top of the kidneys.
