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The thyroid, a word whose name originates from the Greek word (tiros) which means “shield”, is the first endocrine gland to form in the human embryo, developing during the third week of intrauterine life in the direction of the caudal region, accompanying the migration of the aortic arch .
The embryogenesis of the thyroid is complete at about the third month of pregnancy, with the rudimentary thyroid being bilobulated and linked by a ventral isthmus located between the second and third ring of the trachea and growing laterally even after birth ..