Scientjfic Basis of Clinical Practice Thyroid Physiology
نویسنده
چکیده
The thyroid develops from the endoderm in the floor of the pharynx and migrates downwards, anterior to the primitive gut. Faults in the process cause thyroglossal cyst and fistula and the presence of thyroid tissue in abnormal situations, such as the posterior part of the tongue and retrosternally. In mammals the thyroid also contains cells derived from the last branchial pouches, the parafollicular cells which secrete calcitonin. In this article the term thyroid hormones does not include calcitonin.
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