Definition: a transitory endodermal tube in the embryo, carrying thyroid-forming tissue at its caudal end; normally, the duct disappears after the thyroid has moved to its definitive location in the neck; its point of origin is regularly marked on the root of the adult tongue by the foramen cecum; occasionally, its incomplete regression results in the formation of cysts along its embryonic course.
Synonym(s): ductus thyroglossusTA, thyrolingual duct
See Also: pyramidal lobe of thyroid gland
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