The thyroid system
Thyroid hormones are produced from the thyroid under the influence of thyroid-stimulating hormone (TSH) from the anterior pituitary gland, which is itself under the control of thyroptropin-releasing hormone (TRH) secreted by the hypothalamus. Thyroid hormones provide negative feedback, inhibiting secretion of TRH and TSH when blood levels are high.
This is a diagram of the thyroid system. It shows how thyroid hormones are produced from the thyroid under the influence of thyroid-stimulating hormone (TSH) from the anterior pituitary gland, which is itself under the control of thyroptropin-releasing hormone (TRH) secreted by the hypothalamus. Thyroid hormones provide negative feedback, inhibiting secretion of TRH and TSH when blood levels are high.
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