A pair of glands located at the cranial pole of each of the two kidneys. Each adrenal gland is composed of two distinct endocrine tissues with separate embryonic origins, the adrenal cortex producing glucocorticoids and mineralocorticoids and the adrenal medulla producing neurotransmitters.
This definition is at least in part based on: Anonymous (2015), Adrenal gland (English). Medical Subject Headings. U.S. National Library of Medicine.