Adrenal Gland: Either of two secretory organs located on
top of the kidneys and surrounded by the protective fat capsule of
the kidneys. Each consists of two parts having independent
functions: the cortex and the medulla. The adrenal cortex, in
response to adrenocorticotropic hormone secreted by the anterior
pituitary, secretes cortisol and androgens. Adrenal androgens serve
as precursors that are converted by the liver to testosterone and
estrogens. Renin from the kidney controls adrenal corticol
production of aldosterone. The adrenal medulla manufactures the
catecholamines, epinephrine and norepinephrine.