Final answer:
Most people have four parathyroid glands located on the posterior surface of the thyroid gland.
Step-by-step explanation:
Most people have four parathyroid glands, but the number can vary from two to six. These glands are located on the posterior surface of the thyroid gland.
Each parathyroid gland is covered by connective tissue and contains many secretory cells that are associated with a capillary network.