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The hypothalamus releases thyrotropin releasing hormone (TrH), which travels via a venous plexus to the anterior lobe of the pituitary gland and stimulates release of thyroid stimulating hormone (TSH). TSH then induces production of thyroxine (T4) by the thyroid.ased on the functional interrelationship of the hypothalamus, pituitary gland, and thyroid, TSH should be elevated if the thyroid gland is not producing adequate thyroid hormone, and suppressed if it is producing too much (Figure 1).
TRH is released, stimulating the pituitary to release TSH. Increased levels of TSH, in turn, stimulate the thyroid to produce more thyroid hormone, thereby returning the level of thyroid hormone in the blood back to normal. The three glands and the hormones they produce make up the Hypothalamic-Pituitary-Thyroid axis..