The Adrenal Glands: The adrenal glands sit atop each kidney and consist of an outer cortex (producing cortisol, aldosterone, and androgens) and an inner medulla (secreting adrenaline and noradrenaline).
The Parathyroid Glands: The parathyroid glands are small endocrine glands on the posterior thyroid that regulate calcium levels by secreting PTH in response to low blood calcium.