(i) The parathyroid glands consist of four separate glands located on the posterior surface of the lobes of the thyroid gland, one pair each in the two lobes.
(ii) The parathyroid glands secrete parathyroid hormone or parathormone, the secretion of which is regulated by the circulating calcium ion.
(iii) Hypoparathyroidism causes the lowering of blood calcium level thereby leading to parathyroid tetany.