In vertebrate anatomy, the thyroid gland or simply, the thyroid is one of the largest endocrine glands. The thyroid gland is found in the neck, below the thyroid cartilage. The isthmus (the bridge between the two lobes of the thyroid) is located inferior to the cricoid cartilage.
The thyroid gland controls how quickly the body uses energy, makes proteins, and controls how sensitive the body should be to other hormones. It participates in these processes by producing thyroid hormones, the principal ones being triiodothyronine (T3) and thyroxine (T4). These hormones regulate the rate of metabolism and affect the growth and rate of function of many other systems in the body. T3 and T4 are synthesized from both iodine and tyrosine. The thyroid also produces calcitonin, which plays a role in calcium homeostasis.
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