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The parathyroid glands are four tiny glands, located in the neck, that control the body's calcium levels. Each gland is about the size of a grain of rice (weighs approximately 30 milligrams and is 3-4 millimeters in diameter).
Parathyroid glands. There are four parathyroid glands, each the size of a grain of rice, in your neck behind the thyroid gland, They produce parathyroid hormone (PTH) which helps control the levels of calcium, phosphorus and vitamin D within the bones and blood.ypoparathyroidism and hyperparathyroidism are rare hormone disorders caused by the parathyroid glands in the neck producing too little (hypo) or too much (hyper) parathyroid hormone.